Researchers and experts from 15 countries convened in Zambia, between 4-15 March 2024, for an international training on wheat blast disease screening, surveillance, and management.
Wheat blast, caused by pathogen Magnaporthe oryzae pathotype triticum, is threatening global wheat production especially in warmer and humid regions. The disease was ïŹrst observed in Parana state of Brazil in 1985 and subsequently spread to Bolivia, Paraguay, and Argentina. Outside of South America, wheat blast incidences were recorded for the first time in Bangladesh in 2016 and in Zambian wheat fields in 2018.
To mitigate the impact of this potential plant pandemic, the Zambia Agriculture Research Institute (ZARI), in collaboration with CIMMYT and other partners, organized a comprehensive training for building research capacity and raising awareness within the local and international community, especially in at-risk countries.
âThis collaborative effort, supported by various international partners and funders, underscores the importance of global cooperation in addressing agricultural challenges such as wheat blast. The objective of the training was to empower researchers with knowledge and tools for enhanced wheat production resilience in regions vulnerable to this destructive disease,â said Pawan Kumar Singh, principal scientist and project leader at CIMMYT. Singh collaborated with Batiseba Tembo, wheat breeder at ZARI-Zambia, to coordinate and lead the training program.
Thirty-eight wheat scientists, researchers, professors, policymakers, and extension agents from countries including Bangladesh, Brazil, Ethiopia, India, Kenya, Mexico, Nepal, South Africa, Sweden, Tanzania, United Kingdom, Uruguay, Zambia, and Zimbabwe convened at the Mt. Makulu Central Research Station in Chilanga, Zambia.
âWheat blast is a devastating disease that requires concerted efforts to effectively manage it and halt further spread. The disease is new to Africa, so developing capacity amongst country partners before the disease spreads more widely is critical,” said Tembo.
Participants at the International Training on Wheat Blast Screening and Surveillance. (Photo: CIMMYT)
Highlights from the training: discussions, lab exercises, and field visits
During the training, participants engaged in lectures, laboratory exercises, and field visits. There were insightful discussions on key topics including the fundamentals of wheat blast epidemiology, disease identification, molecular detection of the wheat blast pathogen, isolation and preservation techniques for the pathogen, disease scoring methods, disease management strategies, and field surveillance and monitoring.
The course also provided practical experience in disease evaluation at the Precision Phenotyping Platform (PPP) screening nursery located in Chilanga research station. This involved characterization of a diverse range of wheat germplasm with the aim of releasing resistant varieties in countries vulnerable to wheat blast. Additionally, participants undertook field visits to farmers’ fields, conducting surveillance of wheat blast-infected areas. They collected samples and recorded survey data using electronic open data kit (ODK) capture tools.
Participants listen to a lecture by B.N. Verma, director of Zambia Seed Co., on the history of wheat production in Zambia. (Photo: CIMMYT)
âThe killer disease needs to be understood and managed utilizing multi-faceted approaches to limit the expansion and damages it can cause to global wheat production. The Bangladesh Wheat and Maize Research Institute (BWMRI) is willing to share all the strategies it deployed to mitigate the effect of wheat blast,â said Golam Faruq, BWMRIâs director general.
Participants visited seed farms to gain practical insights into seed production processes and quality assurance measures. These visits provided first-hand knowledge of seed selection, breeding techniques, and management practices crucial for developing resistant wheat varieties. Participants also visited research sites and laboratories to observe advanced research methodologies and technologies related to wheat blast management. These visits exposed them to cutting-edge techniques in disease diagnosis, molecular analysis, and germplasm screening, enhancing their understanding of effective disease surveillance and control strategies.
Field visit. (Photo: CIMMYT)
âThe training and knowledge sharing event was a significant first step in developing understanding and capacity to deal with wheat blast for partners from several African countries. It was wonderful to see the efforts made to ensure gender diversity among participants,â said Professor Diane Saunders from the John Innes Centre, UK.
Regional partners examine the CIMMYT maize lines displayed during field day. (Photo: CIMMYT)
The International Maize Improvement Consortium for Africa (IMIC-Africa) held its Southern Africa field day on 25 March 2024 at Harare, Zimbabwe. IMIC-Africa, launched by CIMMYT in 2018, is a public-private partnership designed to strengthen maize breeding programs of partner institutions in Africa. As part of this initiative, CIMMYT organizes annual field days which bring together representatives from seed companies and national agricultural research system (NARS) partners across Zimbabwe and Kenya.
At the heart of the IMIC-Africa field day lies a vibrant showcase of genetically diverse materials developed from various maize breeding pipelines of CIMMYT in Southern Africa. Such events serve as a catalyst to drive innovations in maize breeding programs, deliver solutions to stakeholders, and enable seed companies and NARS partners to make informed selections tailored to local contexts.
âIt is an important forum to have organized discussions with partners, and redesignâwhere possibleâour breeding approaches to deliver targeted products to stakeholders,â said Director of CIMMYTâs Global Maize Program, One CGIAR Global Maize Breeding Lead, and One CGIAR Plant Health Initiative Lead, B.M. Prasanna. âThe main stakeholders here are our partners, including seed companies and public sector national programs, through whom we reach out to farming communities.â
The significance of these field days cannot be overstated. It allows the partners to have a critical look at the breeding materials on display and undertake selections of maize lines relevant to their breeding programs. In addition, the IMIC-Africa field days enable CIMMYT team to have structured dialogues with diverse stakeholders and to review and refine breeding (line and product development) strategies and approaches.
“It is key to bridge the gap between the national programs and private sector players. This platform allows us to stay ahead in terms of research, and innovative breakthroughs in the seed sector,â added Kabamba Mwansa, principal agriculture research officer, ZARI, Zambia and Southern Africa Breeding, and seed systems network coordinator.
Highlights from the Harare field day
With an impressive array of 737 CIMMYT maize lines on display, partners at the Harare field day gained insights about the performance of different materials. The materials span early-, intermediate-, and late- maturity groups to nutritious maize breeding pipelines. This comprehensive showcase enabled seed companies and NARS partners to make informed selections, tailored to their local contexts. The material on display ranged from early generation (one or two years of testing data) to advanced generation (more than three years of testing) coming from the Southern Africa breeding pipelines targeting multiple market segments.
Regional partners examine the CIMMYT maize lines displayed during field day. (Photo: CIMMYT)
One of the strategic priorities of CIMMYT’s maize breeding program in Africa is improving the nutritional quality of maize. This is exemplified by the development of provitamin A-enriched maize (PVA). On display were 169 lines originating from the PVA-enriched maize breeding pipeline. The efforts underscore CIMMYTâs commitment to address regional nutritional needs through targeted breeding initiatives.
Felix Jumbe, a partner from Peacock Seeds in Malawi reflected on the importance of the IMIC-Africa partnership. âWe have been part of IMIC-Africa since its inception, and we continue to appreciate the different climate-resilient lines emerging from CIMMYT maize breeding programs in Africa. Last year, we sold out of our seed as people continue to appreciate the need for resilient maize varieties. The drought-tolerant (DT) maize lines from the consortium have been a huge selling point as most farmers are happy with it,â he said.
The field day not only showcased cutting-edge breeding innovations but also offered a historical perspective by tracing the trajectory of the most popular lines taken up under IMIC-Africa from 2019 to 2023. This served as a crucial reference point for partners, enabling them to assess the performance of newly displayed lines against established benchmarks. Furthermore, partners considered the presence of trait donors as invaluable in improving resistance to key biotic stresses or tolerance to certain abiotic stresses prevalent in Africa.
CIMMYT, NARS, and seed company partners participate in the IMIC-Africa field day in Harare, Zimbabwe. (Photo: CIMMYT)
CIMMYT partnership continues to add value
In the face of escalating environmental pressures, including climate change and pest infestations such as the fall armyworm (FAW), CIMMYT breeders have been working tirelessly to develop resilient varieties capable of withstanding these challenges. Partners such as SeedCo have embraced these robust varieties. For breeder Tariro Kusada, it is her second year of attending the IMIC- Africa field day. âWe continue to see value in getting breeding materials through IMIC. The vigor from the lines on display is outstanding as compared to last year. We hope the vigor translates to yield.â
Danny Mfula from Synergy Zambia reinforced the value of the partnership. âIt is always good to tap into CIMMYT’s germplasm to supplement what we have. We are glad that more FAW-tolerant hybrids are coming on board. We want to leverage on these developments as farmers have gone through a lot of challenges to control FAW,â he said.
As the harvest stage approaches, partners can select their material by assessing the performance of the lines from flowering to grain filling stages. Each plot’s harvest provides invaluable insights, guiding partners in their selections. Partners are also given the opportunity to view the improved maize lines from CIMMYT through a virtual gallery of ears from each plot, ensuring informed decision-making. By fostering dialogue, facilitating partnerships, and highlighting genetic innovations, the field days catalyze progress towards a more sustainable and resilient future for African agriculture.
With the ever-changing climate conditions, including the unpredictable El Niño, and dynamic changes in government policies, understanding farmersâ preferences and market segmentation has become crucial for implementing impactful breeding programs. Market segmentation is a strategic process which divides a market into distinct group of consumers with similar needs, preferences, and behaviors. This allows organizations to tailor their products and services to specific customer segments, thus ensuring maximum value and impact.
In todayâs fast-paced and evolving agricultural landscape, market segmentation plays a vital role in helping organizations navigate the complexities of a dynamic market. CIMMYTâs maize breeding program has a successful track record in developing and delivering improved varieties that are climate-resilient, high-yielding and suited to the rainfed tropical conditions in Africa. To further strengthen the impact, it is important to have a clear understanding of the evolving needs of farmers in different agroecological regions and the emerging market scenario so that breeding processes can be tailored based on market needs and client requirements.
Questions arise on how to refine the breeding programs relative to country-specific market segments, what efforts are underway to target these markets, and how do these markets transition. Recognizing the importance of market segmentation in refining breeding programs at the country and regional levels, CIMMYT hosted two workshops on maize market intelligence in Kenya and Zimbabwe, under the CGIAR Market Intelligence Initiative for eastern and southern Africa.
âMarket intelligence in breeding programs is critical to understand the evolving needs of key stakeholders, including farmers, consumers, and the seed industry. It helps continuously improve the breeding pipelines to develop and deliver impactful products in targeted market segments. The workshops brought together relevant experts from the national programs and seed companies for focused discussions to develop a harmonized breeding strategy. This would help to address the needs of smallholder maize farmers in eastern and southern Africa,â said Director of CIMMYT’s Global Maize program and One CGIAR Global Maize Breeding Lead, B.M. Prasanna.
B.M. Prasanna delivers a presentation. (Photo: CIMMYT)
The workshops constituted a strategic continuation of the Product Design Team (PDT) meetings under CGIAR Market Intelligence, with a focus on the refinement of gender-intentional target product profile design. Guided by the expertise of CIMMYT’s Global Maize program, Market Intelligence, and ABI-Maize Transform teams, the sessions saw active participation from key stakeholders including lead breeders, seed systems experts, and market specialists from the National Agricultural Research and Extension Systems (NARES), alongside collaborative engagement with seed company partners. The workshops underscored the commitment to incorporate diverse perspectives, aligning with the evolving maize market landscape in eastern and southern Africa.
“The workshop provided critical insights on opportunities to improve market penetration of improved maize varieties. There is a need to strike a balance between the needs of the farmers, seed industry, and consumers in variety development; actively involve farmers and consumers in variety selection and understanding their preferences; and focus on emerging needs of the market such as yellow maize for feed and food,â said James Karanja, maize breeding lead at the Kenya Agriculture & Livestock Research Organization, Kenya.
Insights from both workshops underscored the importance of providing breeders with pertinent information and comprehensive training. The discussions illustrated the necessity for breeders to define their objectives with a 360-degree outlook, aligning breeding programs with market segments and interfacing with CIMMYT’s regional vision.
Workshop participants. (Photo: CIMMYT)
âThe market intelligence workshop is an excellent initiative for the breeding programs. It shows how traits can be identified and prioritized, based on farmersâ requirements. The maize value chain is broad, and the synergy between the developer of the product (breeder), the producer (farmer), and the consumer needs to be effective. Hence, streamlining of the market segments and eventually the target product profiles is key in ensuring that the breeders develop improved products/varieties with relevant traits that address the needs of farmers, consumers, and the seed industry,â said Lubasi Sinyinda, breeder from the Zambia Agricultural Research Institute, Zambia.
Another participant, Lucia Ndlala, a maize breeder at the Agricultural Research Council, South Africa, echoed similar enthusiasm. “The workshop was exceptionally informative, providing valuable insights into target product profiles and market segments. This knowledge will undoubtedly prove instrumental in shaping future breeding strategies,” she said.
When applied through a breeding lens, market segmentation is a vital tool in refining breeding programs at both country and regional levels, enabling breeders to better understand and address the diverse needs of the farmers, and ensuring that the improved varieties are tailored to market segments.
One of the worldâs largest crop pathogen surveillance systems is set to expand its analytic and knowledge systems capacity to protect wheat productivity in food vulnerable areas of East Africa and South Asia.
Researchers announced the Wheat Disease Early Warning Advisory System (Wheat DEWAS), funded through a $7.3 million grant from the Bill & Melinda Gates Foundation and the United Kingdomâs Foreign, Commonwealth & Development Office, to enhance crop resilience to wheat diseases.
The project is led by David Hodson, principal scientist at CIMMYT, and Maricelis Acevedo, research professor of global development and plant pathology at Cornell Universityâs College of Agriculture and Life Sciences. This initiative brings together research expertise from 23 research and academic organizations from sub-Saharan Africa, South Asia, Europe, the United States and Mexico.
Wheat DEWAS aims to be an open and scalable system capable of tracking important pathogen strains. The system builds on existing capabilities developed by the research team to provide near-real-time model-based risk forecasts and resulting in accurate, timely and actionable advice to farmers. As plant pathogens continue to evolve and threaten global food production, the system strengthens the capacity of countries to respond in a proactive manner to transboundary wheat diseases.
The system focuses on the two major fungal pathogens of wheat known as rust and blast diseases. Rust diseases, named for a rust-like appearance on infected plants, are hyper-variable and can significantly reduce crop yields when they attack. The fungus releases trillions of spores that can ride wind currents across national borders and continents and spread devastating epidemics quickly over vast areas.
Wheat blast, caused by the fungus Magnaporte oryzae Tritici, is an increasing threat to wheat production, following detection in both Bangladesh and Zambia. The fungus spreads over short distances and through the planting of infected seeds. Grains of infected plants shrivel within a week of first symptoms, providing little time for farmers to take preventative actions. Most wheat grown in the world has limited resistance to wheat blast.
âNew wheat pathogen variants are constantly evolving and are spreading rapidly on a global scale,â said Hodson, principal investigator for Wheat DEWAS. âComplete crop losses in some of the most food vulnerable areas of the world are possible under favorable epidemiological conditions. Vigilance coupled with pathogen-informed breeding strategies are essential to prevent wheat disease epidemics. Improved monitoring, early warning and advisory approaches are an important component for safeguarding food supplies.â
Previous long-term investments in rust pathogen surveillance, modelling, and diagnostics built one of the largest operational global surveillance and monitoring system for any crop disease. The research permitted the development of functioning prototypes of advanced early warning advisory systems (EWAS) in East Africa and South Asia. Wheat DEWAS seeks to improve on that foundation to build a scalable, integrated, and sustainable solution that can provide improved advanced timely warning of vulnerability to emerging and migrating wheat diseases.
âThe impact of these diseases is greatest on small-scale producers, negatively affecting livelihoods, income, and food security,â Acevedo said. âUltimately, with this project we aim to maximize opportunities for smallholder farmers to benefit from hyper-local analytic and knowledge systems to protect wheat productivity.â
The system has already proven successful, contributing to prevention of a potential rust outbreak in Ethiopia in 2021. At that time, the early warning and global monitoring detected a new yellow rust strain with high epidemic potential. Risk mapping and real-time early forecasting identified the risk and allowed a timely and effective response by farmers and officials. That growing season ended up being a production record-breaker for Ethiopian wheat farmers.
While wheat is the major focus of the system, pathogens with similar biology and dispersal modes exist for all major crops. Discoveries made in the wheat system could provide essential infrastructure, methods for data collection and analysis to aid interventions that will be relevant to other crops.
The Wheat Disease Early Warning Advisory System (Wheat DEWAS) project is bringing new analytic and knowledge systems capacity to one of the worldâs largest and most advanced crop pathogen surveillance systems. With Wheat DEWAS, researchers are building an open and scalable system capable of preventing disease outbreaks from novel pathogen strains that threaten wheat productivity in food vulnerable areas of East Africa and South Asia.
The system builds from capabilities developed previously by multi-institutional research teams funded through long-term investments in rust pathogen surveillance, modelling, and diagnostics. Once fully operationalized, the project aims to provide near-real-time, model-based risk forecasts for governments. The result: accurate, timely and actionable advice for farmers to respond proactively to migrating wheat diseases.
The Challenge
Farmers growing wheat face pathogen pressures from a range of sources. Two of the most damaging are the fungal diseases known as rust and blast. Rust is a chronic issue for farmers in all parts of the world. A study in 2015 estimated that the three rust diseases â stem, stripe and leaf â destroyed more than 15 million tons of wheat at a cost of nearly $3 billion worldwide. Wheat blast is an increasing threat to wheat production and has been detected in both Bangladesh and Zambia. Each of these diseases can destroy entire harvests without warning, wiping out critical income and food security for resource-poor farmers in vulnerable areas.
The Response
Weather forecasts and early-warning alerts are modern technologies that people rely on for actionable information in the case of severe weather. Now imagine a system that lets farmers know in advance when dangerous conditions will threaten their crop in the field. Wheat DEWAS aims to do just that through a scalable, integrated, and sustainable global surveillance and monitoring system for wheat.
Wheat DEWAS brings together research expertise from 23 research and academic organizations from sub-Saharan Africa, South Asia, Europe, the United States and Mexico.
Together, the researchers are focused on six interlinked work packages:Â
Work package
Lead
Objectives
Data Management
Aarhus University; Global Rust Reference Center
Maintain, strengthen and expand the functionality of the existing Wheat Rust Toolbox data management system
Create new modules within the Toolbox to include wheat blast and relevant wheat host information
Consolidate and integrate datasets from all the participating wheat rust diagnostic labs
Develop an API for the two-way exchange of data between the Toolbox and the Delphi data stack
Develop an API for direct access to quality-controlled surveillance data as inputs for forecast models
Ensure fair access to data
Epidemiological Models
Cambridge University
Maintain operational deployment and extend geographical range
Productionalize code for long-term sustainability
Multiple input sources (expert, crowd, media)
Continue model validation
Ensure flexibility for management scenario testing
Extend framework for wheat blast
Surveillance (host + pathogen)
CIMMYT
Undertake near-real-time, standardized surveys and sampling in the target regions
Expand the coverage and frequency of field surveillance
Implement fully electronic field surveillance that permits near real-time data gathering
Target surveillance and diagnostic sampling to validate model predictions
Map vulnerability of the host landscape
Diagnostics
John Innes Centre
Strengthen existing diagnostic network in target regions & track changes & movement
Develop & integrate new diagnostic methodology for wheat rusts & blast
Align national diagnostic results to provide a regional & global context
Enhance national capacity for wheat rust & blast diagnostics
Information Dissemination and Visualization Tools
PlantVillage; Penn State
Create a suite of information layers and visualization products that are automatically derived from the quality-controlled data management system and delivered to end users in a timely manner
Deliver near real time for national partners to develop reliable and actionable advisory and alert information to extension workers, farmers and policy makers
National Partner Capacity Building
Cornell University
Strengthening National partner capacity on pathogen surveillance, diagnostics, modeling, data management, early warning assessment, and open science publishing
The food security and livelihoods of smallholder farming families in sub-Saharan Africa depend on maize production. The region accounts for up to two-thirds of global maize production, but is facing challenges related to extreme weather events, climate-induced stresses, pests and diseases, and deteriorating soil quality. These require swift interventions and innovations to safeguard maize yields and quality.
In this Q&A, we reflect on the results and impact of the long-term collaborative work on drought-tolerant maize innovations spearheaded by two CGIAR Research Centers: the International Maize and Wheat Improvement Center (CIMMYT) and International Institute of Tropical Agriculture (IITA). This innovative work has changed guises over the years, from the early work of the Drought Tolerant Maize for Africa (DTMA) and Drought Tolerant Maize for Africa Seed Scaling (DTMASS) projects through later iterations such as Stress Tolerant Maize for Africa (STMA) and the newest project, Accelerating Genetic Gains in Maize and Wheat (AGG).
In this Q&A, three leaders of this collaborative research reflect on the challenges their work has faced, the innovations and impact it has generated for smallholder farmers, and possible directions for future research. They are: B.M Prasanna, director of CIMMYTâs Global Maize Program and of the CGIAR Research Program on Maize (MAIZE); Abebe Menkir, a maize breeder and maize improvement lead at IITA; and Cosmos Magorokosho, project lead for AGG-Maize at CIMMYT.
Briefly describe the challenges confronting small-scale farmers prior to the introduction of drought-tolerant maize and how CIMMYT and IITA responded to these challenges?
B.M.P.: Maize is grown on over 38 million hectares in sub-Saharan Africa, accounting for 40% of cereal production in the region and providing at least 30% of the populationâs total calorie intake. The crop is predominantly grown under rainfed conditions by resource-constrained smallholder farmers who often face erratic rainfall, poor soil fertility, increasing incidence of climatic extremes â especially drought and heat â and the threat of devastating diseases and insect pests.
Around 40% of maize-growing areas in sub-Saharan Africa face occasional drought stress with a yield loss of 10â25%. An additional 25% of the maize crop suffers frequent drought, with yield losses of up to 50%. Climate change is further exacerbating the situation, with devastating effects on the food security and livelihoods of the millions of smallholder farmers and their families who depend on maize in sub-Saharan Africa. Therefore, the improved maize varieties with drought tolerance, disease resistance and other farmer-preferred traits developed and deployed by CIMMYT and IITA over the last ten years in partnership with an array of national partners and seed companies across sub-Saharan Africa are critical in effectively tackling this major challenge.
A.M.: Consumption of maize as food varies considerably across sub-Saharan Africa, exceeding 100 kg per capita per year in many countries in southern Africa. In years when rainfall is adequate, virtually all maize consumed for food is grown in sub-Saharan Africa, with a minimal dependence on imported grain. Maize production, however, is highly variable from year to year due to the occurrence of drought and the dependence of national maize yields on seasonal rainfall. One consequence has been widespread famine occurring every five to ten years in sub-Saharan Africa, accompanied by large volumes of imported maize grain as food aid or direct imports.
This places a significant strain on resources of the World Food Programme and on national foreign exchange. It also disincentivizes local food production and may not prevent or address cyclical famine. It also leaves countries ill-equipped to address famine conditions in the period between the onset of the crisis and the arrival of food aid. Investment in local production, which would strengthen the resilience and self-sufficiency in food production of smallholder farming families, is a far better option to mitigate food shortages than relying on food aid and grain imports.
C.M.: Smallholder farmers in sub-Saharan Africa face innumerable natural and socioeconomic constraints. CIMMYT, in partnership with IITA and national agricultural research system partners, responded by developing and catalyzing the commercialization of new maize varieties that produce reasonable maize yields under unpredictable rainfall-dependent growing season.
Over the life of the partnership, more than 300 new climate-adaptive maize varieties were developed and released in more than 20 countries across sub-Saharan Africa where maize is a major staple food crop. Certified seed of over 100 stress-tolerant improved maize varieties have been produced by seed company partners, reaching more than 110,000 tons in 2019. The seeds of these drought-tolerant maize varieties have benefited more than 8 million households and were estimated to be grown on more than 5 million hectares in eastern, southern and west Africa in 2020.
A farmer in Mozambique stands for a photograph next to her drought-tolerant maize harvest. (Photo: CIMMYT)
In what ways did the drought-tolerant maize innovation transform small-scale farmersâ ability to respond to climate-induced risks? Are there any additional impacts on small scale farmers in addition to climate adaptation?
B.M.P.: The elite drought-tolerant maize varieties can not only provide increased yield in drought-stressed crop seasons, they also offer much needed yield stability. This means better performance than non-drought-tolerant varieties in both good years and bad years to a smallholder farmer.
Drought-tolerant maize varieties developed by CIMMYT and IITA demonstrate at least 25-30% grain yield advantage over non-drought-tolerant maize varieties in sub-Saharan Africa under drought stress at flowering. This translates into at least a 1 ton per hectare enhanced grain yield on average, as well as reduced downside risk in terms of lost income, food insecurity and other risks associated with crop yield variability. In addition to climate adaptation, smallholder farmers benefit from these varieties due to improved resistance to major diseases like maize lethal necrosis and parasitic weeds like Striga. We have also developed drought-tolerant maize varieties with enhanced protein quality â such as Quality Protein Maize or QPM â and provitamin A, which improve nutritional outcomes.
We must also note that drought risk in sub-Saharan Africa has multiple and far-reaching consequences. It reduces incentives for smallholder farmers to intensify maize-based systems and for commercial seed companies to invest and evolve due to a limited seed market.
Drought-tolerant maize is, therefore, a game changer as it reduces the downside risk for both farmers and seed companies and increases demand for improved maize seed, thus strengthening the commercial seed market in sub-Saharan Africa. Extensive public-private partnerships around drought-tolerant maize varieties supported the nascent seed sector in sub-Saharan Africa and has enabled maize-based seed companies to significantly grow over the last decade. Seed companies in turn are investing in marketing drought-tolerant maize varieties and taking the products to scale.
A.M.: The DTMA and STMA projects were jointly implemented by CIMMYT and IITA in partnership with diverse national and private sector partners in major maize producing countries in eastern, southern and western Africa to develop and deploy multiple stress-tolerant and productive maize varieties to help farmers adapt to recurrent droughts and other stresses including climate change.
These projects catalyzed the release and commercialization of numerous stress-resilient new maize varieties in target countries across Africa. Increasing the resilience of farming systems means that smallholder farmers need guaranteed access to good quality stress resilient maize seeds. To this end, the two projects worked with public and private sector partners to produce large quantities of certified seeds with a continual supply of breeder seeds from CIMMYT and IITA. The availability of considerable amount of certified seeds of resilient maize varieties has enabled partners to reach farmers producing maize under stressful conditions, thus contributing to the mitigation of food shortages that affect poor people the most in both rural and urban areas.
C.M.: The drought-tolerant maize innovation stabilized maize production under drought stress conditions in sub-Saharan Africa countries. Recent study results showed that households that grew drought-tolerant maize varieties had at least half a ton more maize harvest than the households that did not grow the drought-tolerant maize varieties, thus curbing food insecurity while simultaneously increasing farmersâ economic benefits. Besides the benefit from drought-tolerant innovation, the new maize varieties developed through the partnership also stabilized farmersâ yields under major diseases, Striga infestation, and poor soil fertility prevalent in sub-Saharan Africa.
How is the project addressing emerging challenges in breeding for drought-tolerant maize and what opportunities are available to address these challenges in the future?Â
Margaret holds an improved ear of drought-tolerant maize. Margaretâs grandmother participated in an on-farm trial in Murewa district, 75 kilometers northeast of Zimbabweâs capital Harare. (Photo: Jill Cairns/CIMMYT)
B.M.P.: A strong pipeline of elite, multiple-stress-tolerant maize varieties â combining other relevant adaptive and farmer-preferred traits â has been built in sub-Saharan Africa through a strong germplasm base, partnerships with national research partners and small- and medium-sized seed companies, an extensive phenotyping and multi-location testing network, and engagement with farming communities through regional on-farm trials for the identification of relevant farmer-preferred products.
CGIAR maize breeding in sub-Saharan Africa continues to evolve in order to more effectively and efficiently create value for the farmers we serve. We are now intensively working on several areas: (a) increasing genetic gains (both on-station and on-farm) through maize breeding in the stress-prone environments of sub-Saharan Africa by optimizing our breeding pipelines and effectively integrating novel tools, technologies and strategies (e.g., doubled haploids, genomics-assisted breeding, high-throughput and precise phenotyping, improved breeding data management system, etc.); (b) targeted replacement of old or obsolete maize varieties in sub-Saharan Africa with climate-adaptive and new varieties; (c) developing next-generation climate-adaptive maize varieties with traits such as native genetic resistance to fall armyworm, and introgressed nutritional quality traits (e.g., provitamin A, high Zinc) to make a positive impact on the nutritional well-being of consumers; and (d) further strengthening the breeding capacity of national partners and small and medium-sized seed companies in sub-Saharan Africa for a sustainable way forward.
A.M.:Â The DTMA and STMA projects established effective product pipelines integrating cutting-edge phenotyping and molecular tools to develop stress-resilient maize varieties that are also resistant or tolerant to MLN disease and fall armyworm. These new varieties are awaiting release and commercialization. Increased investment in strengthening public and private sector partnerships is needed to speed up the uptake and commercialization of new multiple stress-resilient maize varieties that can replace the old ones in farmersâ fields and help achieve higher yield gains.
Farmersâ access to new multiple-stress-tolerant maize varieties will have a significant impact on productivity at the farm level. This will largely be due to new varietiesâ improved response to fertilizer and favorable growing environments as well as their resilience to stressful production conditions. Studies show that the adoption of drought-tolerant maize varieties increased maize productivity, reduced exposure to farming risk among adopters and led to a decline in poverty among adopters. The availability of enough grain from highly productive and stress-resilient maize varieties can be the cheapest source of food and release land to expand the cultivation of other crops to facilitate increased access to diversified and healthy diets.
C.M.: Â The project is tackling emerging challenges posed by new diseases and pests by building upon the successful genetic base of drought-tolerant maize. This is being done by breeding new varieties that add tolerance to the emerging disease and pest challenges onto the existing drought-tolerant maize backgrounds. Successes have already been registered in breeding new varieties that have high levels of resistance to MLN disease and the fall armyworm pest.
Opportunities are also available to address new challenges including: pre-emptively breeding for threats to maize production challenges that exist in other regions of the world before these threats reach sub-Saharan Africa; enhancing the capacity of national partners to build strong breeding programs that can address new threats once they emerge in sub-Saharan Africa; and sharing knowledge and novel high-value breeding materials across different geographies to immediately address new threats once they emerge.
Cover photo: Alice Nasiyimu stands in front of a drought-tolerant maize plot at her family farm in Bungoma County, in western Kenya. (Photo: Joshua Masinde/CIMMYT)
For the first time, wheat blast, a fast-acting and devastating fungal disease, has been reported on the African continent, according to a new article published by scientists from the Zambian Agricultural Research Institute (ZARI), the International Maize and Wheat Improvement Center (CIMMYT) and the US Department of Agriculture â Foreign Disease Weed Science Research Unit (USDA-ARS).
Wheat blast, a fast-acting and devastating fungal disease, has been reported for the first time on the African continent. In an article published in the scientific journal PLoS One, a team of scientists confirmed that symptoms of wheat blast first appeared in Zambia during the 2018 rainy season, in experimental plots and small-scale farms in the Mpika district, Muchinga province.
Researchers from the International Maize and Wheat Improvement Center (CIMMYT), the US Department of Agriculture â Foreign Disease Weed Science Research Unit (USDA-ARS) and the Zambian Agricultural Research Institute (ZARI) participated in this study.
Wheat blast poses a serious threat to rain-fed wheat production in Zambia and raises the alarm for surrounding regions and countries on the African continent with similar environmental conditions. Worldwide, 2.5 billion consumers depend on wheat as a staple food and, in recent years, several African countries have been actively working towards reducing dependence on wheat imports.
âThis presents yet another challenging biotic constraint to rain-fed wheat production in Zambia,â said Batiseba Tembo, wheat breeder at ZARI and lead scientist on the study.
A difficult diagnosis
Researchers from ZARI check for wheat blast in experimental plots. (Photo: Batiseba Tembo/ZARI)
âThe first occurrence of the disease was very distressing. This happened at the spike stage, and caused significant losses,â Tembo said. âNothing of this nature has happened before in Zambia.â
Researchers were initially confused when symptoms of the disease were first reported in the fields of Mpika. Zambia has unique agro-climatic conditions, particularly in the rainfed wheat production system, and diseases such as spot blotch and Fusarium head blight are common.
âThe crop had silvery white spikes and a green canopy, resulting in shriveled grains or no grains at all⊠Within the span of seven days, a whole field can be attacked,â Tembo explained. Samples were collected and analyzed in the ZARI laboratory, and suspicions grew among researchers that this may be a new disease entirely.
Tembo participated in the Basic Wheat Improvement Course at CIMMYTâs global headquarters in Mexico, where she discussed the new disease with Pawan Singh, head of Wheat Pathology at CIMMYT. Singh worked with Tembo to provide guidance and the molecular markers needed for the sample analysis in Zambia, and coordinated the analysis of the wheat disease samples at the USDA-ARS facility in Fort Detrick, Maryland, United States.
All experiments confirmed the presence of the fungus Magnaporthe oryzae pathotype Triticum (MoT), which causes the disease.
âThis is a disaster which needs immediate attention,â Tembo said. âOtherwise, wheat blast has the potential to marginalize the growth of rain-fed wheat production in Zambia and may threaten wheat production in neighboring countries as well.â
Wheat blast spreads through infected seeds and crop residues, as well as by spores that can travel long distances in the air. The spread of blast within Zambia is indicated by both mechanisms of expansion.
Wheat blast has expanded rapidly since it was initially discovered in Brazil in 1985. (Map: Kai Sonder/CIMMYT)
A cause for innovation and collaboration
CIMMYT and the CGIAR Research Program on Wheat (WHEAT) are taking action on several fronts to combat wheat blast. Trainings and international courses invite participants to gain new technical skills and knowledge in blast diagnostics, treatment and mitigation strategies. WHEAT scientists and partners are also studying the genetic factors that increase resistance to the disease and developing early warning systems.
âA set of research outcomes, including the development of resistant varieties, identification of effective fungicides, agronomic measures, and new findings in the epidemiology of disease development will be helpful in mitigating wheat blast in Zambia,â Singh said.
âIt is imperative that the regional and global scientific communities join hands to determine effective measures to halt further spread of this worrisome disease in Zambia and beyond,â Tembo expressed.
Financial support for this research was provided by the Zambia Agriculture Research Institute (ZARI), the CGIAR Research Program on Wheat (WHEAT), the Australian Centre for International Agricultural Research (ACIAR), and the US Department of Agricultureâs Agricultural Research Service (USDA-ARS).Â
The Basic Wheat Training Program and Wheat Blast Training is made possible by support from investors including the Australian Centre for International Agricultural Research (ACIAR), WHEAT, the Indian Council of Agricultural Research (ICAR), Krishi Gobeshona Foundation (KGF), the Swedish Research Council (SRC) and the United States Agency for International Development (USAID).
The Accelerating Genetic Gains in Maize and Wheat (AGG) project is funded by the Bill & Melinda Gates Foundation, the UK Foreign, Commonwealth & Development Office, the United States Agency for International Development and the Foundation for Food and Agricultural Research (FFAR).
About CIMMYT
The International Maize and What Improvement Center (CIMMYT) is the global leader in publicly-funded maize and wheat research and related farming systems. Headquartered near Mexico City, CIMMYT works with hundreds of partners throughout the developing world to sustainably increase the productivity of maize and wheat cropping systems, thus improving global food security and reducing poverty. CIMMYT is a member of the CGIAR System and leads the CGIAR programs on Maize and Wheat and the Excellence in Breeding Platform. The Center receives support from national governments, foundations, development banks and other public and private agencies. For more information visit staging.cimmyt.org.
The Biofortified Maize for Improved Human Nutrition project conducts field research both at CIMMYT and with partners on breeding for increased pro-vitamin A and Zinc content in both Africa and Latin America. The project grant is renewed annually and has been in operation since 2004.
Key activities include supporting early and mid-late product development, evaluation and release in Mexico and target countries in southern Africa, food science and retention studies. Molecular breeding and biochemical analysis are key components for successful breeding, and the project also involves technical backstopping for partners in both regions.
Objectives
Conduct field research on breeding for increased pro-vitamin A for target countries in Africa
Conduct field research on breeding for increased Zinc for product evaluation and release
Conduct essential research to deploy analytical tools and marker assisted selection or genomic selection methods in micronutrient breeding work
Facilitate the dissemination, promotion and consumption of biofortified crops
Kassim Massi and Joyce Makawa have learned how conservation agriculture nurtures the soil of their 2.5-acres farm in Lemu, Malawi, and helps them to better cope with regular dry spells and storm rains. With four children and two grandchildren, their livelihoods depend on rainfed crop farming, in particular maize, the main staple in Malawi, and a few goats and free-range poultry. The International Maize and Wheat Improvement Center (CIMMYT) introduced them to conservation agriculture, along with five other families in their community.
âI have learnt a lot from this experiment. I can see that with crop rotation, mulching and intercropping I get bigger and healthier maize cobs. The right maize spacing, one seed at the time planted in a row, creates a good canopy which preserves the soil moisture in addition to the mulch effect,â Massi explains. âThe mulch also helps to limit water runoff when there are heavy rains. I donât see the streams of mud flowing out of this plot like for my other field where I only planted maize as usual on ridges,â he adds.
Massi and Makawa started small, on a quarter acre, testing maize and maize-pigeon pea intercropping under conservation agriculture. Later they diversified to a maize-groundnut rotation with pigeon pea alleys, while introducing different drought-tolerant maize varieties on their plot. Pigeon pea and groundnut are legume crops that enrich the soil in nitrogen via nodules that host specific bacteria called rhizobia in their root systems. Massi and Makawa also put layers of maize stalks and groundnut haulms on the ground after harvest, creating a mulch that not only enriches the soil in organic matter but retains soil moisture and improves soil structure.
While they got only two bags of 50kg maize grain from their conventionally tilled maize field, they harvested almost three times more maize grain plus three bags of groundnuts, and two and half bags of pigeonpea from the 0.1 hectares grown under conservation agriculture. âThis plot has become our food insurance and we plan to expand it.â
Family farmers Kassim Massi and Joyce Makawa in Lemu, Malawi. (Photo: Shiela Chikulo/CIMMYT)
Good for the soil and good for the farmer
âBuilding healthy soils over the years is one of the great impacts of conservation agriculture,â explains Christian Thierfelder, an agronomist with CIMMYT in Zimbabwe. âWith no tillage, legume rotation or intercropping and crop residue management, a beneficial soil pore structure is developed over time. This enables water to infiltrate into the soil where it is available for plant growth in times of drought or during in-season dry spells.â
Under the GIZ-funded Out scaling climate-smart technologies to smallholder farmers in Malawi, Zambia & Zimbabwe initiative, the different ecosystem services that soils bring have been measured against the typical ploughed maize monocropping system. Fifteen year-long experiments show that 48.5mm more water infiltrates per hour under no-till as compared with the conventional method. Soil erosion is reduced by 64% for ripline-seeded maize with legume intercropping. At the Henderson Research station in Zimbabwe where soil erosion loss has been quantified, it means 90 metric tons per hectare of topsoil saved over twelve years.
âConservation agriculture is good for the soil, and it is good for the farmer. The maize-legume intercropping under conservation agriculture provides very good financial return to labor and investment in most rural communities we worked with,â Thierfelder notes.
Climate mitigation or resilience?
There is growing recognition of the importance of soils in our quest for sustainability.
Soils play for instance an important role in climate regulation. Plants fix carbon dioxide (CO2) through photosynthesis and when those plants die and decompose, the living organisms of the soil, such as bacteria, fungi or earthworms, transform them into organic matter. That way, soils capture huge quantities of the carbon emissions that fuel climate change. This soil organic carbon is also essential for our food security because it retains water, and soil nutrients, essential for growing crops.
The quantity of carbon soils capture depends on the way farmers grow their crops. Conservation agriculture improves soil biodiversity and carbon sequestration by retaining crop residues as mulch, compared to conventional practices.
âResearch shows that practices such as conservation agriculture can restore soil organic carbon at the level of four per thousand when farmers apply all principles of conservation agriculture: no-till, soil cover and crop diversification,â explains Marc Corbeels, agronomist seconded to CIMMYT from Cirad. Increasing soil organic content stocks globally by 0.4% per year is the objective of the â4 per 1000â initiative as a way to mitigate climate change and improve food security. At global level, sequestrating 0.4% more soil organic carbon annually combined with stopping deforestation would counteract the annual rise in atmospheric CO2.
âThe overall soil organic carbon sequestration potential of conservation agriculture should however not be overestimated,â Corbeels warns. âCarbon sequestration is complex and context-specific. It depends for instance on the type of soils and the initial soil organic status, and the crop and biomass productivity as enough crop residues should be produced.â
âNow farmers in Malawi, Zambia and Zimbabwe are facing prolonged drought and, in some parts, farming communities got hit by flash floods. With degraded and barren soils in this tropical environment, it is a disaster. In my experience, more than mitigation, improved climate resilience is a bigger benefit of conservation agriculture for the farmersâ, Corbeels says.
âScience is important to build up solid evidence of the benefits of a healthy soil and push forward much-needed policy interventions to incentivize soil conservation,â Thierfelder states.
Scaling out conservation agriculture practices is what has driven him over the past decade in southern Africa.
âOne big lesson I learnt from my years of research with farmers is that if you treat well your soil, your soil will treat you well. Conservation agriculture adopters like Kassim Massi and his family are more resilient to these successive shocks. We need more farmers like them to achieve greater food security and climate resilience in the region,â he concludes.
December 5, we are celebrating World Soil Day under the theme âStop Soil Erosion, Save our Future!â As CIMMYTâs research shows, farmers cannot deliver sustainable food security without healthy soils, as the farming land producing our staple crops provide important environmental services as well. CIMMYT calls for soil-smart agriculture and food systems.
The United Nations Framework Convention on Climate Change estimates that temperatures in Africa are set to rise significantly in coming years, with devastating results for farmers. Some regions could experience two droughts every five years, and see drastic reductions in maize yields over the next three decades.
Research demonstrates that climate-smart agriculture (CSA) is good method of mitigating the effects of climate change, for both farmers and the planet. Associated practices, which increase soil moisture levels and soil biodiversity have been shown to decrease soil erosion by up to 64%. They also have the potential to increase maize yields by 136% and incomes in dry environments by more than twice as much.
However, adoption rates remain low in some of the countries which stand to benefit the most, such as Malawi, Zambia and Zimbabwe, where the adoption of complete conservation agriculture systems is currently at 2.5%.
A new series of infographics describes some of the farming constraints will have to be addressed in order to scale climate-smart agricultural practices successfully in the region, taking into account both benefits and challenges for farmers.
Geoffrey Ochiengâ, a smallholder farmer from northern Uganda. He plants the UH5051 variety on his land. (Photo: Joshua Masinde/CIMMYT)
Zambiaâs vice-president has recently called to reduce maize dominance and increase crop and diet diversification in his country. The reality is that maize is and will remain a very important food crop for many eastern and southern African countries. Diet preferences and population growth mean that it is imperative to find solutions to increase maize production in these countries, but experts forecast 10 to 30% reduction in maize yields by 2030 in a business-as-usual scenario, with projected temperature increases of up to 2.7 degrees by 2050 and important drought risks.
Knowing the importance of maize for the food security of countries like Zambia, it is crucial to help maize farmers get better and more stable yields under erratic and challenging climate conditions.
To address this, the International Maize and Wheat Improvement Center (CIMMYT) and its partners have been developing hundreds of new maize varieties with good drought tolerance across sub-Saharan Africa. Stakeholders in the public research and African seed sectors have collaborated through the Drought Tolerant Maize for Africa (DTMA) project and the Stress Tolerant Maize for Africa (STMA) initiative to develop drought-tolerant seed that also incorporates other qualities, such as nutritional value and disease resistance.
A groundbreaking impact study six years ago demonstrated that drought-tolerant maize significantly reduced poverty and food insecurity, particularly in drought years.
A new study from CIMMYT and the Center for Development Research (ZEF) in the main maize growing areas of Zambia confirms that adopting drought-tolerant maize can increase yields by 38% and reduce the risks of crop failure by 36%.
Over three quarters of the rainfed farmers in the study experienced drought during the survey. These farming families of 6 or 7 people were cultivating 4 hectares of farmland on average, half planted with maize.
A balancing act between potential gains and climate risks
Drought-tolerant maize has a transformational effect. With maize farming becoming less risky, farmers are willing to invest more in fertilizer and other inputs and plant more maize.
However, taking the decision of adopting new farm technologies in a climate risky environment could be a daunting task. Farmers may potentially gain a lot but, at the same time, they must consider downside risks.
As Gertrude Banda, a lead farmer in eastern Zambia, put it, hybrid seeds have a cost and when you do not know whether rains will be enough âthis is a gamble.â In addition to climate uncertainty, farmers worry about many other woes, like putting money aside for urgent healthcare, school fees, or cooking nutritious meals for the family.
Information is power
An additional hurdle to adoption is that farmers may not know all the options available to cope with climate risks. While 77% of Zambia households interviewed said they experienced drought in 2015, only 44% knew about drought-tolerant maize.
This inequal access to knowledge and better seeds, observed also in Uganda, slows adoption of drought-tolerant maize. There, 14% of farmers have adopted drought-tolerant maize varieties. If all farmers were aware of this technology, 8% more farmers would have adopted it.
Because farmers are used to paying for cheap open-pollinated varieties, they are only willing to pay half of the hybrid market price, even though new hybrids are performing very well. Awareness campaigns on the benefits of drought-tolerant maize could boost adoption among farmers.
According to the same study, the potential for scaling drought-tolerant maize could raise up to 47% if drought-tolerant varieties were made available at affordable prices at all agrodealers. Several approaches could be tested to increase access, such as input credit or subsidy schemes.
These impact studies were made possible through the support provided by the Bill & Melinda Gates Foundation and the US Agency for International Development (USAID), funders of the Stress Tolerant Maize for Africa (STMA) initiative.
Mary Twaya is an exemplary farmer in Lemu, a rural drought-prone community in southern Malawi, near Lake Malombe. On her one-hectare farm she grows cotton, maize, and legumes like groundnut and cowpea, which she just picked from her fields. Since agriculture is Twayaâs sole livelihood, it is important for her to get good harvests, so she can support her three children and her elderly mother. She is the only breadwinner since her husband left to sell coffee in the city and never returned.
Agriculture is critically important to the economy and social fabric of Malawi, one of the poorest countries in the World. Up to 84% of Malawian households own or cultivate land. Yet, gender disparities mean that farmland managed by women are on average 25% less productive than men. Constraints include limited access to inputs and opportunities for capacity building in farming.
Mary Twaya stands by her field during the 2018/19 season. (Photo: Christian Thierfelder/CIMMYT)
Twaya was part of a CIMMYT project that brought climate-smart agriculture practices to smallholder farmers in Malawi, Zambia and Zimbabwe.
She was enthusiastic about adopting climate-smart agriculture practices and conservation agriculture strategies in her plot. âI have always considered myself an active farmer, and when my husband left, I continued in the project around 2007 as part of the six lead âmother farmersâ with about 30 more âbaby farmersâ learning through our field trials,â Twaya explained.
âWe worked in Lemu since 2007 with Patrick Stanford, a very active and dedicated extension officer who introduced conservation agriculture to the village,â said CIMMYT agronomist Christian Thierfelder. âFarmers highlighted declining yields. The Lemu community was keen to transform their farming system, from conventional ridge tillage to more sustainable and climate-adapted cropping systems.â This was an ideal breeding ground for new ideas and the development of climate-smart solutions, according to Thierfelder.
Mulching, spacing and legume diversification
Showing her demonstration plot, which covers a third of her farm, Twaya highlights some of the climate-smart practices she adopted.
âMulching was an entirely new concept to me. I noticed that it helps with moisture retention allowing my crops to survive for longer during the periods of dry spells. Compared to the crops without mulching, one could easily tell the difference in the health of the crop.â
âThanks to mulching and no tillage, a beneficial soil structure is developed over time that enables more sustained water infiltration into the soilââ, explained Thierfelder. âAnother advantage of mulching is that it controls the presence of weeds because the mulch smothers weeds unlike in conventional systems where the soil is bare.â
Research shows that conservation agriculture practices like mulching, combined with direct seeding and improved weed control practices, can reduce an average of 25-45 labor days per hectare for women and children in manual farming systems in eastern Zambia and Malawi. This time could be used more productively at the market, at home or in other income-generating activities.
A plate full of pigeon peas harvested from Maryâs plot in Lemu, Malawi. Pigeon pea grain has a high protein content of 21-25%, making it a valuable food for many families who cannot afford dairy and meat. (Photo: Shiela Chikulo/CIMMYT)
After 12 years of practicing conservation agriculture, Twaya confirms that she does not spend too much time in the field because she just uproots the weeds with no need for using a hoe. This makes the weeding task less laborious and allows her to spend her time on other chores such as fetching water, washing laundry or cleaning her homestead. âI have time to also go to the village banking and loan savings club to meet with othersâ.
Adopting optimum plant density, instead of throwing in three seeds in each planting hole was another transformational change. The âSasakawa spacingâ â where maize seeds are planted 25 centimeters apart in rows spaced every 75 centimeters â saves seed and boosts yields, as each plant receives adequate fertilizer, light and water without competing with the other seeds. This practice was introduced in Malawi in the year 2000 by Sasakawa Global.
Twaya pays more attention to the benefits of planting nitrogen-fixing crops alongside her maize, as she learned that âthrough crop rotation, legumes like pigeon pea improve the nutrition of my soil.â In the past she threw pigeon pea seeds loosely over her maize field and let it grow without any order, but now she practices a âdouble-up legume system,â where groundnut and pigeon pea are cropped at the same time. Pigeon peas develop slowly, so they can grow for three months without competition after groundnut is harvested. This system was introduced by the Africa RISING project, funded by USAID.
Groundnuts and pigeon peas grow under the double-up legume system in Mary Twayaâs conservation agriculture plot. (Photo: Christian Thierfelder/CIMMYT)
A mother farmer shows the way
Switching to climate-smart agriculture requires a long-term commitment and knowledge. Some farmers may resist to the changes because they initially find it new and tedious but, like Twaya observed, âit may be because they have not given themselves enough time to see the long-term benefits of some of these practices.â
With all these innovations â introduced in her farm over the years with the support of CIMMYT and the Ministry of Agriculture, Irrigation and Water Development of Malawi â Twaya reaped important economic and social benefits.
When Twaya rotates maize and pigeon pea, the maize stalks are healthy and the cobs are big, giving her higher yields. Passing-by neighbors will often exclaim ââIs this your maize?ââ because they can tell it looks much more vigorous and healthier than what they see in other fields.
For the last season, Twaya harvested 15 bags of 50kg of maize from her demo plot, the equivalent of five tons per hectare. In addition to her pigeon pea and groundnut crops, she was able to feed her family well and earned enough to renovate her family home this year.
This new way of managing her fields has gained Twaya more respect and has improved her status in the community.
Through surplus sales of maize grain, pigeon pea and groundnuts over the past 12 years, Mary has generated enough income to build a new home. Nearing completion, she has purchased iron sheets for roofing this house by the end of 2019. (Photo: Shiela Chikulo/CIMMYT)
Approaching the homestead of Joseph Maravire and his wife, Reason, on a warm late August afternoon in Bvukururu, Zaka district, Zimbabwe, heaps of dry straw in their farmyard are prominent. ââThis is for mulching for the forthcoming cropping season,ââ explains Reason. Maize stalk residues from last harvest are also stored to feed their livestock and to mix into the manure or for bedding the herd of cattle. These practices have become the norm for the Maravire family as they prepare for the next maize planting season in Zaka, one of the hottest areas of southern Zimbabwe.
âWe never knew of mulching until we interacted with CIMMYT scientists in 2009. Now I cannot imagine working in my field without applying mulch,â says Reason. As one of five families selected in their village to participate in the scaling out of climate-smart agricultural technologies since 2009, the Maravire family demonstrates the evident transformative power of climate-smart agriculture.
Joseph and Reason by their heap of dry straw which is collected in preparation for mulching in the forthcoming 2019-20 season. In this drought-prone region, the Maravire learned the benefits of mulching to protect crops from recurrent dry spells. (Photo: Shiela Chikulo/CIMMYT)
Climate-smart agriculture involves farming practices that improve farm productivity and profitability, help farmers adapt to the negative effects of climate change and mitigate climate change effects, e.g. by soil carbon sequestration or reductions in greenhouse gas emissions. Climate-smart practices, such as the locally practiced conservation agriculture, aim at conserving soil moisture, retaining crop residues for soil fertility, disturbing the soil as minimally as possible and diversifying through rotation or intercropping.
As CIMMYT research shows, these practices can boost production and make farmers more food secure.  This is good news for Zimbabwean farmers such as the Maravires. During an episode of El Niño in the 2015-16 and 2018-19 cropping seasons, large parts of southern Africa experienced prolonged dry spells, erratic rainfall and high temperatures initially with floods towards the end of the cropping season. A recent humanitarian appeal indicated that at least 2.9 million people in Zimbabwe were severely food insecure due to poor or no harvests that year.
Under the âOut-scaling climate-smart technologies to smallholder farmers in Malawi, Zambia & Zimbabweââ project — funded by the German development agency GIZ and the Centre for Coordination of Agricultural Research and Development for Southern Africa (CCARDESA), and implemented under the leadership of the Zambian Agriculture Research Institute (ZARI) with technical oversight by CIMMYT and other collaborating partners from Malawi and Zimbabwe — Â farmers from 19 rural communities in the three target countries received training and guidance on climate-smart agriculture practices and technologies, such as mulching, rotation and the use of direct seeders and ripper tines to practice no tillage.
Mastering climate-smart techniques, season by season
On their 0.4-hectare plot dedicated to the project activities, Joseph and Reason practiced four different planting techniques: direct seeding (sowing directly into crop residue), ripline seeding (sowing in lines created by animal draft-powered rippers), basin planting (sowing manually into planting basins created by hand hoes), and the traditional ox drawn plowing and seeding. They then planted one traditional and three drought-tolerant maize varieties.
âIt soon became clear to us that using a direct seeder or ripper tine, combined with mulching, was the best option, as these sections of the field retained more moisture and produced more maize than the conventional system,â explained Joseph Maravire. Beginning in 2013, the family also started rotating maize and cowpeas and observed a significant increase in their yields. They decided to apply climate-smart agriculture practices on the rest of their 2.5-hectare farm.
âWe learned that cowpeas leave nitrogen in the soil and by the time of harvesting, the leaves from the cowpeas also fall to the ground as residue and add to the mulch for the soil. The shade of cowpea also reduces weed pressure and manual weeding,â said Maravire.
Yields and food security
With these practices, the family has harvested remarkably, even during the dry seasons. In 2015-16, the worst El Niño on record, they harvested 2 tons of maize, despite the severe drought, while other households barely got anything from their fields. In good years, like the last cropping season, the family harvests 3.5 to 4 tons of maize from their entire field, three times more than their annual family food needs of approximately 1.3 tons. The additional cowpea yields of both grain and leaves provide protein-rich complementary food, which improves the familyâs nutrition. To share some of these benefits with their community, the Maravire family donates up to 10% of their produce to poor elderly households in their village.
Overcoming challenges and building resilience
However, the new farming practices did not come without challenges.
âIn the early days of the project, the ripper tine was not simple to use because we could not get the right depth to put manure and the maize seeds,â said Joseph Maravire.
They found a solution by making rip lines around October or November, applying manure at the onset of the rains, ripping again and placing the seed to mix with the manure.
Fall armyworm was another devastating challenge for their plot, as was the case around Zimbabwe. Like other farmers in Zimbabwe, the Maravires had access to pesticides, but the caterpillar showed some resistance to one type of pesticide. Maravire expressed interest in learning biological control options to reduce the pestâs spread.
Scaling climate smart technologies beyond the Maravire homestead
After several years of consistently good harvests with climate-smart agriculture options, the Maravire family has become a model within their community. Working closely with their agricultural extension officer, they formed a CSA farmer support group of 20 families. Joseph Maravire provides services for direct seeding and ripping to the CSA group and ensures that all of their land is prepared using no-tillage planting techniques. The couple regularly demonstrates climate-smart practices to peers during field days, where an average of 300 villagers attend. They also share their knowledge about green manure cover crops â crops such as lablab, jackbean, sunhemp, and velvet bean which, retained on the soil surface, serve as organic fertilizer â a practice they learned from project activities.
For Reason and Joseph Maravire, the rewards for adopting climate-smart agriculture benefit the family beyond food security. The income earned from maize grain sales and cowpea marketing has helped them acquire assets and rebuild one of their homes that was destroyed by Cyclone Idai in March 2019.
Joseph is confident that his family will always produce well on the replenished soil and the technologies they have learned through the project will continue to define their farming practices.
The house of Maravire homestead was damaged by Cyclone Idai in March. Joseph is nearing completion of rebuilding the house using proceeds from recent cowpea sales. (Photo: Shiela Chikulo/CIMMYT)
International scientists are working with regional and national partners in sub-Saharan Africa to catalyze local wheat farming and help meet the rapidly rising regional demand for this crop.
The specialists are focusing on smallholder farmers in Rwanda and Zambia, offering them technical and institutional support, better links to markets, and the sharing of successful practices across regions and borders, as part of the project âEnhancing smallholder wheat productivity through sustainable intensification of wheat-based farming systems in Rwanda and Zambia.â
âWork started in 2016 and has included varietal selection, seed multiplication, and sharing of high-yielding, locally adapted, disease-resistant wheat varieties,â said Moti Jaleta, a socioeconomist at the International Maize and Wheat Improvement Center (CIMMYT) who leads the project. âOur knowledge and successes in smallholder wheat production and marketing will also be applicable in Madagascar, Mozambique, and Tanzania.â
Harvesting wheat at Gataraga, Northern Province, Rwanda.
Maize is by far the number-one food crop in sub-Saharan Africa but wheat consumption is increasing fast, driven in part by rapid urbanization and life-style changes. The region annually imports more than 15 million tons of wheat grain, worth some US$ 3.6 billion at current prices. Only Ethiopia, Kenya, and South Africa grow significant amounts of wheat and they are still net importers of the grain.
âGrowing more wheat where it makes sense to do so can help safeguard food security for people who prefer wheat and reduce dependence on risky wheat grain markets,â Jaleta explained. âWeâre working in areas where thereâs biophysical potential for the crop in rain-fed farming, to increase domestic wheat production and productivity through use of improved varieties and cropping practices.â
In addition to the above, participants are supporting the regionâs wheat production in diverse ways:
Recommendations to fine-tune smallholder wheat value chains and better serve diverse farmers.
Testing of yield-enhancing farming practices, such as bed-and-furrow systems that facilitate efficient sowing and better weed control.
Testing and promotion of small-scale mechanization, such as power tillers, to save labor and improve sowing and crop establishment.
Exploring use of hand-held light sensors to precisely calibrate nitrogen fertilizer dosages throughout the cropping season.
Innocent Habarurema, wheat breeder in the Rwanda Agriculture and Animal Resources Development Board (RAB), cited recent successes in the release of improved, disease resistant wheat varieties, as well as engaging smallholder farmers in seed multiplication and marketing to improve their access to quality seed of those varieties.
âThe main challenge in wheat production is the short window of time between wheat seasons, which doesnât allow complete drying of harvested plants for proper threshing,â Habarurema explained. âSuitable machinery to dry and thresh the wheat would remove the drudgery of hand threshing and improve the quality of the grain, so that it fetches better prices in markets.â
Millers, like this one in Rwanda, play a key role in wheat value chains.
Critical wheat diseases in Zambia include spot blotch, a leaf disease caused by the fungus Cochliobolus sativus, and head blight caused by Fusarium spp., which can leave carcinogenic toxins in the grain, according to Batiseba Tembo, wheat breeder at the Zambian Agricultural Research Institute (ZARI).
âDeveloping and disseminating varieties resistant to these diseases is a priority in the wheat breeding program at Mt. Makulu Agricultural Research Center,â said Tembo. âWeâre also promoting appropriate mechanization for smallholder farmers, to improve wheat production and reduce the enormous drudgery of preparing the soil with hand hoes.â
Participants in the project, which runs to 2020, met at Musanze, in Rwandaâs Northern Province, during February 5-7 to review progress and plan remaining activities, which include more widespread sharing of seed, improved practices, and other useful outcomes.
âThere was interest in trying smallholder winter wheat production under irrigation in Zambia to reduce the disease effects normally experienced in rainfed cropping,â said Jaleta, adding that the costs and benefits of irrigation, which is rarely used in the region, need to be assessed.
Project participants may also include in selection trials wheat varieties that have been bred to contain enhanced grain levels of zinc, a key micronutrient missing in the diets of many rural Africa households.
âThe project will also push for the fast-track release and seed multiplication of the best varieties, to get them into farmersâ hands as quickly as possible,â Jaleta said.
In addition to CIMMYT, RAB, and ZARI, implementing partners include the Center for Coordination of Agricultural Research and Development for Southern Africa (CCARDESA). Generous funding for the work comes from the International Fund for Agricultural Development (IFAD) and the CGIAR Research Program on Wheat.
Climate mitigation or resilience? 
âScience is important to build up solid evidence of the benefits of a healthy soil and push forward much-needed policy interventions to incentivize soil conservation,â Thierfelder states.
