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Combatting maize lethal necrosis in Zimbabwe

Maize is a staple crop in Zimbabwe, playing a vital role in the country’s agricultural landscape as food for its own people and an export good. However, behind every successful maize harvest lies the quality of seed and resistance to diseases and stresses.

Amidst the multitude of diseases that threaten maize crops, one adversary is maize lethal necrosis (MLN). Though not native to Zimbabwe, it is crucial to remain prepared for its potential impact on food security.

What is maize lethal necrosis?

MLN is a viral disease, caused by a combination of two virus diseases. The disease emerged in Kenya in 2011 and quickly spread to other countries in eastern Africa. The introduction of MLN to Africa was likely affected by the movement of infected seed and insect vectors. MLN has had a severe impact on regional maize production, leading to yield losses of up to 90%.

Recognizing the need to equip seasoned practitioners with the knowledge and skills to effectively diagnose and manage MLN, CIMMYT organized a comprehensive training on MLN diagnosis and management, targeting 25 representatives from Zimbabwe’s Plant Quarantine Services.

From students to experienced technicians, pathologists and plant health inspectors, this was an opportunity to refresh their knowledge base or an introduction to the important work of MLN mitigation. “This training for both advanced level practitioners and students is crucial not only for building competence on MLN but also to refresh minds to keep abreast and be prepared with approaches to tackle the disease once it is identified in the country,” said Nhamo Mudada, head of Plant Quarantine Services.

Maize plants showing maize lethal necrosis (MLN). (Photo: CIMMYT)

Expectations were diverse, ranging from sharpening understanding of key signs and symptoms to learning from country case examples currently ridden with the disease. With CIMMYT’s guidance, practitioners learned how to identify MLN infected plants, make accurate diagnoses, and implement management strategies to minimize losses.

“For over 10 years, these trainings have been important to raise awareness, keep local based practitioners up to speed, help them diagnose MLN, and make sure that they practice proper steps to tackle this disease,” said L.M Suresh, CIMMYT maize pathologist and head of the MLN screening facility in Kenya.

Identifying the specific MLN causing viral disease affecting a maize plant is the first step in combating MLN. Determining whether it is a biotic or abiotic disease is critical in establishing its cause and subsequent diagnosis. By implementing proper diagnostic techniques and understanding the fundamentals of good diagnosis, practitioners can bring representative samples to the lab and accurately identify MLN.

Tackling MLN in Zimbabwe

Initiated in 2015 at Mazowe as a joint initiative between the Government of Zimbabwe and CIMMYT, a modern quarantine facility was built to safely import maize breeding materials from eastern Africa to southern Africa and enable local institutions to proactively breed for resistance against MLN.

The MLN quarantine facility at the Plant Quarantine Institute is run by the Department of Research and Specialist Services (DRSS) and is mandated to screen maize varieties imported under strict quarantine conditions to ensure that they are MLN-free.

Training participants pose outside of the MLN screening facilities. (Photo: CIMMYT)

To date, CIMMYT and partners have released 22 MLN resistant and tolerant hybrids in eastern Africa. CIMMYT’s research and efforts to combat MLN have focused on a multidimensional approach, including breeding for resistant varieties, promoting integrated pest management strategies, strengthening seed systems, and enhancing the capacity of farmers and stakeholders.

“Support extended through valuable partnerships between CIMMYT, and the collaborations have played a pivotal role from surveillance to diagnostics and building capacity,” said Mudada.

Feedback and insights

Chief Plant Health Inspector for Export and Imports Biosecurity, Monica Mabika, expressed gratitude for the training. “It is always an honor when we have expert pathologists come through and provide a valuable refresher experience, strengthening our understanding on issues around biosecurity and learning what other countries are doing to articulate MLN,” she said.

Students learn how to screen maize plants for MLN. (Photo: CIMMYT)

Among the students was Audrey Dohwera from the University of Zimbabwe, who acknowledged the importance of the training. “I have been attached for 2 months under the pathology department, and I was eager to learn about MLN, how to detect signs and symptoms on maize, how to address it and be able to share with fellow farmers in my rural community,” she said.

With the knowledge gained from this training, practitioners are well equipped to face the challenges that MLN may present, ultimately safeguarding the country’s maize production status.

Strengthening seed systems with Zamseed

Bram Govaerts and Amsal Tarekegne compare a maize hybrid. (Photo: Katebe Mapipo/CIMMYT)

Maize is a vital crop in Zambia and Tanzania, both for farmers’ economic livelihoods and for delivering nutrients and sustenance to a large group of people. But maize is threatened by climate change, like more severe droughts, and from pests like fall army worm (FAW), which can completely devastate farmers’ fields.

Against this backdrop of looming threats, CIMMYT, as part of the Southern Africa Accelerated Innovation Delivery Initiative (AID-I) Rapid Delivery Hub, or MasAgro Africa, is partnering with the Zambia Seed Company Limited (Zamseed) to distribute seeds that are drought tolerant and resistant to the ravages of FAW. And because maize is a staple of many people’s diets, CIMMYT and Zamseed are also developing and distributing maize varieties enhanced with vitamin A.

To uphold maize variety integrity, CIMMYT and Zamseed are engaged in the capacity building of quality assurance and quality control for local stakeholders.

CIMMYT’s engagement with Zamseed involves efforts to popularize high yielding, drought-tolerant, and vitamin enhanced maize varieties in Zambia and Tanzania. Some of these efforts include demonstrations of the new varieties, field days held at different stages of maize development, and deliberate engagement of women throughout the entire seed selection, planting and harvesting effort.

“Our partnership with Zamseed started in October 2022,” said Ir Essegbemon Akpo, a CIMMYT maize seed systems specialist. “It has been a fruitful collaboration, delivering significant outputs to thousands of farmers in Zambia and Tanzania.”

To date, Zamseed has held 300 and 500 demonstrations in Tanzania and Zambia, respectively. The company has held many field days at the demonstration sites to showcase drought tolerant and vitamin A enhanced maize to hundreds of small-scale farmers.

“We have witnessed many farmers who visited the demonstration activities who are excited to see the new high yielding and drought tolerant varieties,” said Amsal Tarekegne of Zamseed.

Seeded by funds from the AID-I project, Zamseed is producing 60kg of Early Generation Seed (EGS) of parents of a FAW-tolerant hybrid maize variety. The company plans to produce 200kg of this hybrid for commercialization and launch in 2024.

To ensure that seeds delivered to farmers are of the highest quality, CIMMYT is working with Zamseed to develop quality assurance and control frameworks, involving genotyping of selected seeds at various times during the seed multiplication and distribution process.

Zamseed has been servicing the requirements of farmers in the sub-Sahara region since 1980, focusing on products that will enhance the profitability of the small-scale farmer and ensure household food security.

Strengthening seed systems emphasized to enhance Bhutan’s seed and food security initiatives

Quality seed is a crucial agricultural input for enhancing crop production and productivity per unit of land. However, in many developing countries, including Bhutan, ensuring the availability, affordability, and accessibility of quality seed, especially of preferred varieties, remains a significant challenge for farmers. Maize is the second most important cereal in Bhutan after rice. However, the total area dedicated to cereal cultivation in Bhutan has been decreasing due to factors such as rural-urban migration, urban expansion, and the effects of climate change.

Between 2016 and 2021, the areas under rice and maize cultivation have contracted by 55% and 64%, respectively (FAOSTAT, 2022). This huge reduction in cereal cultivation, combined with relatively low productivity, has led Bhutan to rely on imports to bridge the gap and meet the demand for essential food crops, including maize. The Bhutanese government is committed to enhancing domestic capacity and fostering self-sufficiency in major food crops and discourages the import of seed, especially of hybrid maize.

AbduRahman Beshir, seed systems specialist at CIMMYT, displays incomplete fertilization of maize cobs. (Photo: Passang Wangmo/ARDC-Wengkhar)

Hybrid maize seed to offset deficit

Recognizing the significance of improving maize productivity, the Agriculture Research & Development Center (ARDC) in Bhutan is working on the development and deployment of hybrid maize that has the potential to double yields compared to non-hybrid varieties. In 2020, Bhutan officially released its first hybrid maize variety, Wengkhar Hybrid Maize-1 (WHM-1), which was sourced from CIMMYT. Furthermore, several other hybrid maize varieties from CIMMYT are currently in the pipeline for release and evaluation, including those tolerant to fall armyworm (Spodoptera frugiperda), the most important maize pest in Bhutan.

Despite the testing and release of hybrid maize varieties, the production of high-quality seed—vital for realizing the benefits of hybrid maize for Bhutanese farmers—has yet to take place. The seed industry in Bhutan is primarily informal, with the majority of farmers relying on farm-saved seed of often inferior quality. The absence of a formalized seed system, coupled with a lack of the necessary skills and technical expertise across the seed value chain, presents considerable challenges in building a competitive and vibrant seed sector in Bhutan.

Training workshop emphasizes the strengthening of seed systems

To ensure a consistent supply of high-quality maize seed to Bhutanese farmers, which is essential for seed and food security and improved productivity, ARDC in collaboration with CIMMYT, under the CGIAR Seed Equal Initiative, carried out an international training workshop on quality seed production and distribution, with the main focus on hybrid maize, from 13–15 November 2023 at ARDC-Wengkhar, Mongar.

The three-day workshop involved 30 participants from diverse organizations, including the National Seed Centre, the College of Natural Resources, extensions agents from the eastern region, the Bhutan Food and Drug Authority, and agriculture research and development centers. The workshop aimed to enhance participants’ technical skills in understanding and applying the principles and practices of quality hybrid maize seed production; to promote synergistic partnerships among various seed sector stakeholders for initiating and scaling up quality hybrid maize seed production in Bhutan; and to exchange experiences and lessons to be learned from South Asian countries that can be applied to strengthening Bhutan’s seed system.

Participants discuss during the workshop. (Photo: AbduRahman Beshir/CIMMYT)

“This is the first kind of training I have received on hybrid maize seed production, and it was very relevant, action-oriented and applicable to our condition in Bhutan,” says Kinley Sithup, a researcher at ARDC-Wengkhar, Mongar, and adds that the training workshop was a useful forum for identifying key challenges and the role of stakeholders across the seed value chain, which were discussed in detail during the group work in the training.

Recently, the Bhutanese government has restricted the import of hybrid maize seed in order to promote import substitution and enhance local seed production. “In light of the unavailability of imported hybrid seeds, it’s crucial for us to intensify our efforts in scaling up local seed production,” says Dorji Wangchuk, project director of the Commercial Agriculture and Resilient Livelihood Enhancement Program (CARLEP), while addressing the participants during the opening.

The training workshop covered courses on seed system components, maize breeding concepts, hybrid seed production principles, the development of a seed roadmap on production and marketing, hybrid seed pricing and marketing approaches, seed quality control and certification, among others. A field visit along with hands-on training at ARDSC Lingmethang enriched the learning experience. In addition, experiences from other South Asian countries on hybrid seed production and marketing were shared during the training.

A group photo with the participants of the seed systems training workshop in Bhutan. (Photo: ARDC)

Team up for seed production

A significant outcome is the planned initiation of the inaugural hybrid maize seed production group in Udzorong, Trashigang, scheduled for January 2024 in collaboration with extension, the National Seed Center, and the Bhutan Food and Drug Authority. This initiative, supported by CARLEP-IFAD and CIMMYT, reflects a dedicated effort to strengthen Bhutan’s seed sector and enhance maize production for the benefit of local farmers. Fast-track variety release and seed deployment are important to Bhutanese smallholder farmers to mitigate the challenges of lower productivity. “CIMMYT is ready to continue working with partners in Bhutan,” says Program Director of the Global Maize Program at CIMMYT and the One CGIAR Plant Health Initiative lead, BM Prasanna, while delivering his messages online. Prasanna added that CIMMYT has licensed three fall armyworm-tolerant hybrids for Bhutan, and partners need to team up for the release and seed-scaling of the hybrids.

The training workshop on hybrid maize seed was the first of its kind to be held in Bhutan and was conducted under the CGIAR Seed Equal Initiative in collaboration with ARDC and CARLEP. AbduRahman Beshir, seed systems specialist at CIMMYT, delivered the main courses, with additional virtual presentations from CIMMYT staff from India and Kenya.

Early maturity products popular among farmers in Kenya

Across all production environments in Kenya, early-maturity products demonstrate strong sales. This was revealed in a recent study by the CGIAR Initiative on Market Intelligence. During the long-rains season, farmers in higher rainfall production environments—wet, mid and high altitudes—purchased early-maturity seed products despite potentially lower yields. Also, the short-rains season, which represents almost one-fourth of total maize seed sales, was dominated by early-maturity products.

These insights were obtained through a panel of maize-seed sales data from 722 agrodealers in Kenya during two short-rains seasons and three long-rains seasons in 2020–2022. The study also offers insights into the extent the maturity level of seed products, purchased by farmers in Kenya, aligns with the production environment where they were sold. Market Intelligence applies eight criteria to identify seed product market segments (SPMSs) for CGIAR crop breeding. In the application of these criteria to maize in East Africa, two conditions distinguish the segments: production environment and maturity level. The other criteria do not vary. A key indicator for prioritizing breeding investments across segments is the relative size of SPMSs. In the case of maize, and other crops, teams generally use geospatial data to identify the area of production environments, with the assumption that farmers in each production environment would use the seed product with the maturity level designed for that environment.

The paper contends that a stronger focus on using sales data to inform breeding decisions in maize, and potentially other crops where retailers play an important role in seed distribution, should become a priority for market intelligence. Future work will engage stakeholders in maize seed systems in other countries of East Africa about the changes in demand for earlier-maturing products and the implications for segmentation.

This article is adapted from Market Intelligence Brief 5: Maize Farmers Acquire Early-Maturity Seed Across Production Environmentsthe fifth paper in the ongoing peer-reviewed series published inMarket Intelligence Briefs.

*About Market Intelligence Briefs

The CGIAR Initiative on Market Intelligence (‘Market Intelligence’ for brevity) represents a new effort to engage social scientists, crop-breeding teams, and others to work together toward the design and implementation of a demand-led breeding approach. In 2022, the Market Intelligence Brief (MIB) series was created as a valuable communication tool to support informed decision making by crop breeders, seed-system specialists, and donors on future priorities and investments by CGIAR, NARS, the private sector, and non-governmental organizations (NGOs).

The author would like to thank all funders who supported this research through their contributions to the CGIAR Trust Fund. This project received funding from the Accelerating Genetic Gains in Maize and Wheat project (AGG) [INV-003439], funded by Bill & Melinda Gates Foundation; Foundation for Food & Agriculture Research (FFAR); United States Agency for International Development (USAID); and United Kingdom’s Foreign, Commonwealth & Development Office (FCDO).

LIPS-Zimbabwe empowers farmers through innovative intercropping trials

Since 2021, CIMMYT, in partnership with the International Livestock Research Institute (ILRI), the French Agricultural Research Centre for International Development (CIRAD), and the University of Zimbabwe’s Department of Veterinary, has been working in rural communities of Zimbabwe, as part of the Livestock Production Systems in Zimbabwe (LIPS-Zim) project. The activity is led by Zimbabwe’s Department of Research and Specialist Services and is at the forefront of introducing new agricultural innovations to local farmers.

One of their most impactful initiatives has been the intercropping trials involving maize and various legumes including jack bean, mucuna, lablab, and pigeon pea. This groundbreaking approach has not only transformed the lives of farmers but has also had a positive impact on the overall health of livestock.

Various leguminous fodder crops have been promoted widely as sources of high-quality protein feed in mixed crop-livestock systems of Zimbabwe. However, to diversify and increase the options for the drier regions, the LIPS-Zim project is testing new leguminous crops such as jack bean and pigeon pea, which are well-adapted to dry conditions.

Intercropping trials with jack bean and maize (Photo: CIMMYT)

Netsai Musekiwa, a farmer in the town of Mutoko, has been part of the LIPS-Zim project for the past two seasons, and is currently conducting intercrop trials with jack bean. “Since I started intercropping maize with jack bean, I have been amazed by the results and will continue on this path. The jack bean plants have shown strong tolerance to prolonged dry spells and heat stress,” she said. “Next season, I plan to extend my plot to harvest more jack bean.” These words of encouragement on intercropping maize with jack bean have also been largely echoed by many other farmers in Mutoko and Buhera during the feedback meetings held in October 2023.

What is intercropping and how beneficial is it to farmers?

Intercropping is an agricultural practice of growing two or more crops together on the same field simultaneously to maximize land use and enhance productivity. As different crops have different growth patterns and nutrient requirements, intercropping can help optimize resource utilization and boost overall crop output.

In addition, intercropping reduces the risk of climate induced crop failure as well as minimizing pest damage, enhances soil fertility by diversifying the root system, and can provide additional income streams to farmers.

The science behind jack bean and pigeon pea

Jack bean (canavalia ensiformis) and pigeon pea (cajanus cajan) are leguminous crops valued for their nitrogen-fixing abilities which aides in improving soil fertility. Both jack bean and pigeon pea have deep root systems, making them ideal candidates for the dry semi-arid conditions in Zimbabwe.

Pigeon pea is known for its drought-tolerance and produces edible seeds used in various culinary dishes and is a source of both food and feed. Jack bean is used as a forage crop for livestock, providing nutritious feed.

“Jack bean seeds contain a toxic compound called canavanine, which can be harmful when consumed in large quantities or not properly processed. To make jack beans safe for consumption, it must be boiled, soaked, or fermented,” said Isaiah Nyagumbo, cropping systems agronomist at CIMMYT. “We have introduced many farmers to the best practices for handling jack beans and have opened up new possibilities for its utilization in sustainable farming practices.”

While some farmers were intercropping with jack bean, others explored pigeon pea as an alternative. “I liked the intercropping of maize and pigeon pea on my plot. I am assured of getting nutritious food both for my family and livestock. After harvesting, I usually take the branches, then put them in the shade and dry them to retain the nutritional value. I occasionally give some to my goats during the dry season when feed from natural pastures is scarce, and my goat herd has risen to 12 goats,” said Fungai Kativu, a farmer in Mutoko.

Building capacity of local farmers

To narrow the knowledge gap and highlight the potential of such feed options, LIPS-Zim has also been spearheading the establishment of community level learning centers. These centers are a knowledge hub to local farmers, providing practical knowledge, facilitating the sharing of different perspectives while nurturing working as groups with a common vision. This “farmer learns by seeing” approach has been a success in the community.

Through this initiative, farmers have not only witnessed increased productivity but have also gained the necessary skills and knowledge to adapt to the changing agricultural landscape. “Intercropping leguminous crops with maize has shown great potential in improving food security and livestock feed production in Zimbabwe’s farming communities, especially in areas prone to heat and drought,” said Nyagumbo.

In Ethiopia, workshop brings together stakeholders on climate risk analysis outputs

CIMMYT and the Global Center on Adaptation, along with the Ethiopian Ministry of Agriculture’s Food Systems Resilience Program (FSRP), presented the results of their joint research on climate risks during a two-day workshop held in October in Addis Ababa.

Participants of the workshop in Addis Ababa (Photo: CIMMYT).

For over a year and a half, agricultural experts, academics and scientists worked together under the project Digital Climate Advisory Services for Priority Agricultural Value Chains in Ethiopia, which aimed to analyze the risks posed by climate change on five value chains – wheat, maize, coffee, soybean and livestock – and to offer practical adaptation options. CIMMYT conducted the studies in collaboration with the Ministry of Agriculture and with the sponsorship of GCA. The workshop was attended by experts from the Ministry of Agriculture, the Ethiopian Institute of Agricultural Research, the Ethiopian Metrology Agency, the Ethiopian Agricultural Transformation Institute, the Food and Agriculture Organization (FAO), the Green Agro Solutions, among other organizations.

From research outcomes to practical solutions

As a prelude to the two-day discussion, CIMMYT senior scientist, Kindie Tesfaye, expressed his hopes that the research findings will be translated into practical solutions in the field. In turn, GCA Food Security senior program officer Mercy Nyambura invited the guests to share their insights, knowledge and expertise on how the joint research outputs could be put to use.

Highlighting that climate variability and climate extreme events are the main two factors undermining food security in Ethiopia, Keberu Belayneh, FSRP’s head at the Ministry of Agriculture, underlined the need for multi-partnerships to respond and adapt to climate change. He farther shared his hope that the program will contribute to the government’s ongoing efforts to ensure food security in the country.

Offering the perspective of a private sector actor, Green Agro Solutions’ executive director Abrhame Endrias hailed the partnership between his company and CIMMYT in five districts where the company deployed its digital platform LERSHA – “for agriculture” in Amharic. LERSHA provides farmers with vital weather forecasts, as well as other services such as farm inputs, mechanization services, and agro-climate advice. In addition, development agents are bridging the literacy gap between the farmers and the digital services, added Abrhame Endrias. In the five districts where CIMMYT and Green Agro Solutions partnered, LERSHA ‘s adoption rates increased, Abrhame Endrias noted.

Vibrant discussions

The results on the five value chains were presented in five different sessions. The first day of the workshop, Debre Markos University’s Dereje Ademe communicated the findings of the studies on the maize and soybean value chains, while  Abate Mekuriaw, associate professor at the Addis Ababa University, introduced the results on the wheat value chain. They were followed on the second day by  Adama Ndour and Mekdes Woldegiorgis, post-doctoral researchers at CIMMYT-Ethiopia, who discussed with the audience their findings on the current and future climate risks for the coffee and cattle value chains.

Echoing Kindie Tesfaye and Mercy Nyambura’s call, the conversations mainly focused on the potential implementation of the research outcomes, with multiple participants voicing their wishes to see the outputs cascading down to district levels.

Keberu Abayneh, the head of the FSRP in the Ministry of Agriculture, gave a closing remark at the end of the workshop thanking CIMMYT, the technical team that carried out the studies, the Ministry of Agriculture and all stakeholders who took part in it.

Following this, the first Regional Climate Risk Analysis Output Communication Workshop was held in Adama, Ethiopia, from November 13-14, 2023.

As highlighted in the first workshop, the research findings needed to be cascaded down to the regional and district level in order to be implemented successfully. To this end, the second workshop brought together the main representatives from regional agricultural offices in the 11 regional states, who engaged in discussions around the research findings, recommendations, and implementation methods. Researchers, agricultural experts, and representatives from the Ministry of Agriculture, Green Agro Solution, CIMMYT and FSRP also took part in the discussions.

Participants of the workshop in Adama (Photo: CIMMYT).

This workshop, held with the aim of engaging participants from 11 regional states in active discussions and gathering feedbacks, is believed to lay the groundwork for cascading down the research results for implementation.

When representatives from regional states presented on their respective areas, they found more common points than differences. Climate change risk on each of the five value chains is felt across Ethiopia due to extremes and variances in rainfall and temperatures, and many regions are shifting cultivating seasons, forwarded by up to three months because of late-onset of rainfall. These incidents are forcing farmers to change conventional cultivation patterns, with those who stick to the conventional schedule at risk of losing their yields. Some farmers have even changed the types of crops they grow as a result.

Participants noted that the recommended adaptation plans are commendable and implementable in their respective areas, with the proper guidance and resources. In order to ensure tangible impact, they asked for the research documents on the priority value chains to be communicated to a wider range of stakeholders in each regional state.

Creating awareness on the climate risk and the adaptation plans, building capacity to ensure the implementation, piloting and then scaling up implementation across the regional states with consistent monitoring and evaluation can bring effective results, stakeholders agreed.

 

Nepal maize farmers share vision of a more profitable future with visiting agriculture officials

In a visit to 5 model sites for maize marketing in midwestern Nepal, 30 federal, provincial and local agricultural authorities were impressed with the coordination and capacity development among market actors, improved supply chain management and leveraging of government support, all of which are benefiting farmers and grain buyers.

Following visits to commercial maize fields and hearing stakeholders’ perceptions of progress and key lessons, the authorities proposed additional funding for irrigation, machinery, grain grading and crop insurance, among other support, and promised to help expand activities of the model sites, which were established as part of the Nepal Seed and Fertilizer (NSAF) project.

Led by CIMMYT with funding from the United States Agency for International Development (USAID) and in its second-last year of operation, the project is working to raise crop productivity, incomes and household food and nutrition security across 20 districts of Nepal, including 5 that were severely affected by the catastrophic 2015 earthquake and aftershocks which killed nearly 9,000 and left hundreds of thousands homeless.

Participants at Sarswoti Khadya Trader, Kohalpur, Banke. (Photo: CIMMYT)

The visitors included officials and experts from the Ministry of Agriculture and Livestock Development (MoALD); the Department of Agriculture (DoA); the Ministry of Land Management, Agriculture and Cooperatives (MoLMAC); the Agriculture Development Directorates (ADD) for Lumbini and Sudurpaschim provinces; the Agriculture Knowledge Centres (AKC) of Banke, Kailali, Kanchanpur, Dang, and Kapilvastu districts; the Prime Minister Agriculture Modernization Project (PMAMP) offices of Dang and Bardiya; and the National Maize Research Program; the Department of Livestock Services; along with NSAF project team members.

The participants interacted with farmers, cooperative leaders, traders, rural municipality officials and elected representatives, and feed mill representatives. Sharing their experiences of behavioral change in maize production, farmers emphasized the benefits of their strengthened relationships with grain buyers and their dreams to expand spring maize cultivation.

Shanta Karki, deputy director the General of Department of the DoA lauded CIMMYT efforts for agriculture growth, improved soil fertility and sustainable agriculture development through NSAF.

Madan Singh Dhami, secretary, MoLMAC in Sudurpaschim Province, emphasized the importance of irrigation, building farmers’ capacities and interactions with buyers, and applying digital innovations to catalyze extension.

CIMMYT scientists have been based in CIMMYT’s office in Nepal and worked with Nepali colleagues for more than three decades to boost the productivity, profitability and ecological efficiency of maize- and wheat-based cropping systems and thus improve rural communities’ food security and livelihoods.

Fall armyworm research, development and extension for horticulture

Breeding for fall armyworm resistance in maize: an update from CIMMYT

Staff from the Queensland Department of Agriculture and Fisheries (DAF)Agriculture VictoriaFood and Fibre Gippsland, and Bowen Gumlu Growers Association joined B.M. Prasanna (Maize Program Director at CIMMYT & CGIAR Plant Health Initiative Lead) on 19th October 2023 to learn about CIMMYT’s efforts and experiences with fall armyworm management at the global scale, and to build partnerships between CIMMYT and Australian institutions for future collaboration on plant health management.

At the online meeting, Prasanna shared CIMMYT’s research and development on FAW management in maize, including breeding for insect-pest resistance, screening maize germplasm against FAW under artificial infestation, and collaborative approaches on integrated pest management of FAW.

Key points from the discussion:

  • Collaborative efforts are important in managing FAW, and international R&D collaboration is as important as country-level research efforts.
  • CIMMYT has made significant progress in breeding FAW-tolerant maize hybrids (with native genetic resistance); three such hybrids have been released by national partners in Kenya, Zambia, Malawi, South Sudan, and Ghana, and several more countries in Africa are in the pipeline for release and deployment of these hybrids.
  • Insect resistance management is critical wherever Bt maize varieties have been already released or in the process of release.
  • Both conventionally derived and Bt-based resistant maize varieties have their own importance in FAW management.
  • Need to intensify breeding activities for developing elite maize germplasm with FAW resistance together with other important traits, and fast-track deployment of FAW-tolerant elite maize hybrids.
  • Possible to achieve synergies between host plant resistance and other IPM approaches for sustainable management of FAW.
  • Researchers interested in accessing germplasm from CIMMYT’s breeding program can source through a standard material transfer agreement.

Dr Prasanna responded to several queries from the participants of the meeting. Australian researchers and CIMMYT showed interest in further research collaboration. Dr Ramesh Raj Puri, DAF Extension Officer, facilitated the meeting.

Integrating gender into crop breeding

The Seed Production Technology for Africa (SPTA) project, led by CIMMYT, has been selected by the CGIAR Gender Impact Platform as a successful case study of integrating gender into crop breeding.

The case study, published in Frontiers in Sociology, is one of fourteen that the CGIAR Genetic Innovation Gender strategy is drawing on to showcase lessons learned from practical experience. These case studies form a critical part of the efforts to pursue gender responsive or gender-intentional breeding and explore how these can inform larger breeding pipelines.

Maize is widely grown by both women and men in Africa. Evidence of gender-differentiated preferences for maize varieties remains inconclusive; however, there is evidence of gendered differences in management practices. Hybrids produced using SPTA segregate 1:1 for pollen producing and non-pollen producing plants referred to as 50% non-pollen producing (FNP) varieties. Previous research showed FNP offered a yield benefit under low input conditions. In the early stage of its inception, the project quickly recognized the potential implications of hybrids produced using SPTA for women and other resource-constrained smallholders in Africa.

Understanding gender-based differences

From the start, the SPTA team conducted a gender review that underscored the fact that women in the region often use less fertilizer than men, a challenge that is further compounded by cultivation of smaller plots and lower quality soils. This review led the breeding team to explicitly target women and resource-poor farmers with an ambition to increase yields on women’s fields. From here henceforth, SPTA made it a priority to understand gender-based differences in performance and preference for new FNP maize varieties. This process involved ensuring both women and men farmers host trials to evaluate and attest to the performance of the FNP hybrids.

But these efforts were not without challenges. The team also found significant gender differences, particularly among women farmers in crop management practices and between farmers’ stated preferences during participatory varietal selection exercises and the varieties they used at home. This suggested that initial on-farm evaluations were not adequate for predicting real world demand for varieties. Moving forward, the evaluation strategy of SPTA evolved to enable variety evaluations under farmers’ preferred management practices.

The success of the SPTA team in ensuring that gender considerations were strongly embedded into the breeding program is attributed to strong collaboration across disciplines that included social scientists and gender researchers working closely with breeders, allocating funding to allow exploration, testing of gender topics and responsive variety evaluation tools and strong buy-in from leadership and donors. As the SPTA case highlights, there is value in starting small, building productive partnerships and collaborating to pilot and develop proof of concept for new models.

Empowering women smallholder farmers in Africa with climate-resilient and nutritious maize varieties

In the vast landscapes of sub-Saharan Africa, where agriculture is the backbone of many communities, the quest for improved maize varieties is a vital step for ensuring food security in the face of climate change. Women, who represent approximately half the clients of maize breeding programs, have been essential in the realm of agricultural research. While significant gender-based differences in trait preferences exist in many African-staple crops, these appear less drastic in maize. However, there are gendered differences in management practices and productivity in maize-based systems.

After decades of work on maize improvement projects, CIMMYT has made a bigger commitment to researching, supporting and delivering drought and heat tolerant maize to smallholders in Zimbabwe. (Photo: CIMMYT)

Recognizing the need to bridge this gap, the CIMMYT-NARES (National Agricultural Research and Extension Systems) regional maize breeding networks in eastern and southern Africa have embarked on a transformative journey to empower farmers, especially women, through their innovative approach to maize breeding. The breeding networks are focused on ensuring smallholder farmers have access to a steady stream of climate-resilient and nutritionally enriched maize varieties that thrive in today’s stress-prone environments. To ensure these new maize varieties meet the needs of diverse users, including women, the breeding networks continue to adapt approaches to increase gender-responsiveness.

Linking science with the realities on the ground

Testing the performance of potential new maize hybrids coming from the breeding pipelines within farmers’ realities is critical to the ultimate success of these new varieties. In collaboration with over 400 farmers in southern Africa, the CIMMYT-NARES maize breeding network conducts extensive on-farm trials to evaluate the performance of these new maize varieties. A similar approach is adopted in eastern Africa. What sets these trials apart is the fact that over 40% of these trials are led by female plot managers. Farmers evaluate these varieties within the context of their own realities, including their own management practices, and provide valuable feedback to the breeding teams on the potential of new varieties.

By involving women in decision-making processes, CIMMYT-NARES networks ensure that their preferences and needs are considered when selecting the most promising hybrids for product advancement, announcement to partners, varietal releases and ultimately commercialization. This inclusive approach not only empowers women but also harnesses the collective knowledge and experience of the farming community. CIMMYT’s research recently showed that there is a relatively high degree of joint management within maize plots, and since 2022, the on-farm trials included a target of approximately 30% jointly managed plots.

Gender is only one axis of social difference that impacts agricultural production, variety selection, and end uses. Social differences including marital status, age, education level, ethnicity, wealth, access to capital, market access and livelihood orientation do play a role in the adoption of new varieties and farm productivity. By embracing the diversity within farming communities, CIMMYT-NARES networks are actively working towards understanding different farm types, while ensuring that the improved maize varieties are tailored to meet the diverse demands of the regions.

As the CIMMYT-NARES maize breeding networks continue to make innovative strides in breeding climate-resilient and nutritionally enriched maize varieties, they are not only transforming agriculture but also empowering individuals and communities. Through collaborative efforts, with the woman farmer at the heart of the approach, they are paving the way for a future where farming communities can thrive and contribute to food and nutritional security.

Exploring alternative solutions: the case for synthetic mulch in a changing world

Food security remains elusive for most smallholder farmers reliant on rainfed crop production, given the erratic rainfall patterns induced by climate change in Southern Africa. Among others, conservation agriculture (CA) is a concept often considered to be effective to adapt to these erratic rainfall patterns, enabling farmers to cope better with the prolonged dry spells that are characteristic of the semi-arid regions in Zimbabwe.

Conservation agriculture essentially involves three key pillars, namely, reduced soil disturbance, the use of crop rotations or intercrop associations, and the provision of permanent soil cover. The soil-cover component often requires the use of previous crop residues or other organic materials as a surface mulch. However, local farmers consider this task to be the most laborious aspect of implementing CA, which poses a significant challenge to its widespread uptake.

Collecting insights on influence of synthetic mulch. (Photo: CIMMYT)

Traditionally, farmers are advised to use organic mulch, such as maize residues, for soil cover. However, in most communal areas, there is a growing scarcity of organic mulches as they are predominantly used as livestock feed in mixed crop-livestock farming systems. Ironically, semi-arid regions that benefit from the use of crop residues as soil cover are also regions where the residues are the scarcest due to competing uses as livestock feed or as firewood. These competing interests pose a dilemma, as it is essential to cover the soil while also necessary to feed the animals. In neighboring countries like Malawi, maize residues are also used as fuel for firewood, further increasing the demand. It is clearly important, therefore, to develop alternative solutions to address this pressing issue.

“Since I embarked on my journey in conservation agriculture back in 1998, the matter of residues has been a topic of discussion. It is imperative that we walk the talk and develop practical solutions to meet the needs of farmers who rely on residues to feed their animals. One potential solution we are exploring is the use of synthetic mulches to cover the soil. By employing this method, we can cover the soil, apply fertilizer, and hopefully witness a positive impact. We certainly must develop synthetic materials that can be used sustainably as surface mulches in the semi-arid environments where organics are most scarce yet most needed,” stated Isaiah Nyagumbo, regional cropping systems agronomist.

To test such innovations, some water-conservation experiments were established in Buhera and Mutoko, Zimbabwe, during the last two seasons, and the results have been encouraging.

“I am grateful to work with the CIMMYT team on these water conservation trials, and I hope they continue. Before the trials, we were using organic mulch, but after using the synthetic approach and comparing it with organic mulches and none at all, we are seeing so many positive results. But there are challenges we can’t escape, including affordability. But I have seen higher yield returns this year as I harvested close to 15 by 50kgs of maize,” said Nyawasha, a farmer from Mutoko, Zimbabwe, ward 16.

Further detailed studies to understand these systems have also been established in the current dry season at the CIMMYT campus in Harare, to test the effectiveness of these synthetic mulches under conditions of severe moisture stress. The different treatments include clear synthetic mulch, black synthetic mulch, organic mulch and no mulch. So far, for the maize crop now at flowering stage, the growth and yield are strikingly better in plots under the synthetic mulches compared with the organic and no mulch plots. This clearly shows the importance of finding viable alternatives. The crop with synthetic mulches also developed much faster, all the way from crop emergence.

Exploring the tied-ridging system

In these trials, mulching treatments are being tested in conventionally tilled plots, CA basins (pfumvudza basins) and under the tied-ridging system. Tied ridging has been developed in Zimbabwe for use by smallholder farmers since the 1980s and is well known for its effectiveness in reducing sheet erosion and water run-off. This system employs ridges 15–20 cm high, with crossties in the furrows at 1–2 m intervals that trap rainwater and prevent runoff and soil erosion. However, in a typical rainfed system, poor germination challenges can arise when planting on top of these ridges due to excessive drying of moisture from the raised ridges. Furthermore, during prolonged dry spells, the exposed ridges tend to cause crops to wilt more than flat-planted conventional crops. To address these issues, scientists at CIMMYT in Zimbabwe are also exploring innovative ways to improve the tied-ridging system through ways that minimize water loss through direct soil evaporation.

“This has been one of the shortcomings of the tied-ridging system, and we need ways to overcome this excessive moisture evaporation. Once the water has gone into the soil, it should only leave through plant uptake and not be wasted through direct soil evaporation,” said Nyagumbo.

Integrating synthetic mulch into the tied-ridge system. (Photo: CIMMYT)

One approach being considered is incorporating mulch into the system to reduce evaporation and ensure that captured water is retained. The results are evident in the vibrant greenery of the plants with mulch compared with those without. Observing the number of plants with tassels and silk, it is clear that the plots with clear synthetic material have faster growth and reach maturity sooner compared with the plots with black synthetic mulch.

“My outlook on the use of synthetic mulch on ridges is that they are much more effective, as it makes the soil very loose for good aeration to the plant and encourages high growth rate. I noticed that plants germinated in three days and the little water provided will directly benefit the plant without escaping. I am encouraged to continue doing this tied ridge approach using synthetic material,” said Nyekete, a farmer in Buhera, Zimbabwe, ward 7.

While exploring various options, it has also been important to prioritize and focus on one aspect at a time. The initial focus has been on maize residue, as it is a valuable resource for both soil cover and livestock feed. However, the scarcity of maize residue poses a significant challenge for many farmers, especially in regions like Buhera, Mberengwa and Shurugwi, where animals consume all available resources. Placing maize residues in open fields is not a very viable solution, as freely roaming livestock will just consume it. Fencing or creating structures to protect the residues from livestock also requires substantial effort and resources, thereby making this mulching a daunting task for farmers.

Food for thought

While the challenges faced in providing mulch for conservation agriculture are multifaceted, there is a growing need to develop innovative solutions that address the scarcity of organic mulch and explore alternative methods such as synthetic coverings. By continuously adapting and refining our practices, we can ensure the sustainability of agriculture in this region and improve the livelihoods of farmers.

Preventing nitrogen loss in maize

The widespread availability of chemical nitrogen fertilizers is a prime driver of the vast improvement of crop yields over the past 50 years. However, their use has come with a price, as nitrogen escaping into surrounding soil and air has negative impacts on the environment and human health, including water pollution, depletion of soil-fertility, and greenhouse gas emissions.

Researchers from CIMMYT and JIRCAS (Japan International Research Center for Agricultural Science) examined ways to curtail the leakage of nitrogen into ecosystems, through a process called biological nitrification inhibition (BNI) in the paper “Genetic variation among elite inbred lines suggests potential to breed for BNI-capacity in maize,” published in the journal Scientific Reports on August 17, 2023.

César Daniel Petroli, leader and specialist in high-throughput genotyping/sequencing at the Genetic Analysis Service for Agriculture (SAGA) laboratory at CIMMYT with scientists. (Photo: Alfredo Sáenz)

BNI is a plant-based natural process that reduces nitrogen losses, which can reduce fertilizer demand while sustaining agricultural systems. The roots of plants that exhibit BNI activity release natural substances that inhibit the activity of nitrifying bacteria in soil, thus reducing the amount of nitrogen lost to the surrounding ecosystem. Many plant species have natural BNI activity in their roots.

Although synthetic chemical nitrification inhibitors are commercially available to reduce nitrogen losses, the high costs of this approach have limited its adoption. By contrast, breeding new varieties with increased natural BNI activity can offer a practical and economical approach to reduce nitrogen fertilizer need and waste.

“We are in the discovery phase regarding BNI activity and its determining traits for maize. Such information is crucial to pave the way for breeding programs and genetic improvement efforts,” said Kevin Pixley, co-author of the paper and former director of CIMMYT’s Genetic Resources Program. “We need to identify genetic markers for BNI compounds including ‘zeanone’, which will enable breeders to develop maize varieties that require and waste less nitrogen fertilizer, while achieving high yields.”

Doubles haploids prepared for evaluation and further analysis at CIMMYT’s headquarters, El Batán, Mexico. (Photo: Araceli Balderas)

This research identified 18 single nucleotide polymorphisms (SNP) that act as genetic “signposts” for breeders to use to accelerate and increase the accuracy of breeding to increase BNI activity for maize. The researchers also identified six “candidate” or putative genes associated with BNI activity and related to nitrogen use efficiency, thereby enhancing the understanding of the genetics controlling BNI activity.

“Our identification of SNPs and genes that regulate how maize processes nitrogen begins to draw a road map to guide the development of molecular markers for use in breeding new maize varieties that meet farmer and consumer needs at a lower environmental cost,” said senior author Cesar Petroli. “Building on the results obtained and reported in our recent publication, we are developing maize (doubled haploid) populations to refine the genetic map for BNI activity in maize”.

This research was conducted with partners from JIRCAS and the Universidad de la República, Uruguay.

Harnessing new high-resolution satellite imagery to plant breeding

In plant breeding, efforts to increase the rate of genetic gains and enhance crop resilience to the effects of climate change are often limited by the inaccessibility and costs of phenotyping methods. The recent rapid development of sensors, image-processing technology and data analysis has provided new opportunities for multiple scales phenotyping methods and systems. Among these, satellite imagery may represent one of the best ways to remotely monitor trials and nurseries planted in multiple locations, while standardizing protocols and reducing costs.

This is because relevant data collected as part of crop phenotyping can be generated from satellite images. For instance, the sensors onboard the SkySat satellite constellation of Planet Labs have four spectral bands—blue, green, red, and infrared—which can be used to calculate the normalized difference vegetation index (NDVI), which is a measure of vegetation and its greenness, and various canopy traits like ground cover, leaf area index and chlorosis. It can also be used to monitor plot establishment and phenological parameters.

High-resolution RGB orthomosaic of wheat experiments, assessing the effect of plot size and spacing in the spectral signature, collected from SkySat satellite images. (Photo: Gilberto Thompson)

The use of satellite-based phenotyping in breeding trials has typically been restricted by low resolution, high cost and long intervals between fly-overs. However, the advent of a new generation of high-resolution satellites—such as the SkySat constellation—now offers multispectral images at a 0.5m resolution with close to daily acquisition attempts on any place on Earth. This could be a game changer in terms of the scale at which yield trials can be conducted, enabling more precise variety placement and thereby increasing genetic diversity across farmer’s fields and reducing the probability of disease epidemics. It could also revolutionize the capacity for research in realistic field conditions, since traits can be measured throughout the cycle in a highly standardized way, over multiple sites at low cost. For example, an image which covers 25 km2 can monitor an entire research station at a cost of about US$300.

To test the suitability of this technology, a team of researchers from CIMMYT set out to evaluate the reliability of SkySat NDVI estimates for maize and wheat breeding plots of different sizes and spacing, as well as testing its capacity for detecting seasonal changes and genotypic differences.

Both their initial findings, recently published in Frontiers in Plant Science, and more recently acquired data, show that the SkySat satellites can be used to monitor plots commonly used in wheat and maize nurseries. While wheat yield plots usually are 1.2m wide, maize plots tend to consist of at least two rows, resulting in a width of 1.5m. Plot length ranges from 2-4m. The authors also discuss on other factors to be considered when extracting and interpreting satellite data from yield trials, such as plot spacing.

Through the successful collection of six satellite images in Central Mexico during the rainy season and parallel monitoring of a maize trial in Zimbabwe, the researchers demonstrate the flexibility of this tool. Beyond the improvement of spatial resolution, the researchers suggest that the next challenge will be the development and fine-tuning of operational procedures that ensure high quality, standardized data, allowing them to harness the benefits of the modern breeding triangle, which calls for the integration of phenomics, enviromics and genomics, to accelerate breeding gains.

Read the full study: Satellite imagery for high-throughput phenotyping in breeding plots

This research was supported by the Foundation for Food and Agriculture Research, the CGIAR Research Program on Maize, the CGIAR Research Program on Wheat, and the One CGIAR Initiatives on Digital Innovation, F2R-CWANA, and Accelerated Breeding.

El Niño event declared: Impacts on the Limpopo river basin in Southern Africa expected

The International Water Management Institute (IWMI) and CIMMYT call on policymakers and research-for-development organizations to stay informed about the evolving El Niño event and its potential implications in the Limpopo Basin. El Niño is considered the biggest climate oscillation on Earth. IWMI and CIMMYT have utilized various methodologies and climate models to project and assess the potential impacts of the El Niño event.

What are the crucial practices, especially under the changing climatic conditions about the evolving El Niño event?

Read the full story.

Hard work pays off

Nepal is an agricultural country, where the sector provides the major source of income for half the population. Despite this, the sad reality is that the country is not able to produce enough crops to meet its needs, and major grains like rice, maize, and cereals are mostly imported.

One factor influencing this is an aging population of farmers, alongside decreasing interest in agriculture among the country’s youth. Many young people do not see agriculture as a viable option for employment, opting instead for work opportunities outside the country. However, there are still some youth who see agriculture as a profitable business, like Pradeep Morya.

“It is better to work hard in your home country rather than going abroad and working tirelessly every minute and hour,” says Morya, a 24-year-old farmer from Banke, Nepal, who finds happiness in living close to his family and helping to support national food security. “I love being in the field,” he explains. “I have cultivated spring maize on one hectare. My day-to-day business is to provide care to the spring maize along with pumpkins and beans that I have added for additional income on a small plot of land.”

Morya grows spring maize, pumpkin, and beans (Photo: CIMMYT)

Working alongside his eldest brother, Morya has cultivated 30 kattha of land (equivalent to 0.36 hectares) using the spring maize varieties Pioneer 1899 and DK 9108. His brother, a member of Mahatarkari cooperative in Duduwa, western Nepal, has been providing him with the knowledge and expertise needed for maize cultivation.

Mahatarkari is one among 50 cooperatives working in partnership with the Nepal Seed and Fertilizer project (NSAF), which is implemented by CIMMYT. NSAF works with the cooperatives to provide technical knowledge and training to farmers, to hone their potential and support them in the adoption of modern technologies which can improve their livelihoods. After participating in programs organized by NSAF, Morya makes sure that the suggestions he receives — on soil preparation, weed management, harvesting, and more — are implemented in his field.

Returning to the family farm

A few years back, the situation was different. Like many youths in the country, Morya also went abroad to try his luck on the international job market. He worked hard for two years in Malaysia but was forced to return to Nepal during the COVID-19 pandemic.

“I had imagined my shining future abroad. However, when I reached there, the reality was different,” recalls Morya. “I returned to my own country just before the lockdown in April 2021 with some small savings. Upon my arrival in Nepal, I was clueless about my future. I dropped my education after grade five. With no educational qualifications and skills in hand, it was difficult to get a decent job.”

Agriculture has provided Morya with a sustainable source of income in his home country. (Photo: CIMMYT)

Since the country was in lockdown, Morya chose to stay at home and support his family on the farm. It was here that his eldest brother guided him into farming, and Morya soon learned the knowledge needed to run the farm and began earning money from it. This attracted him towards farming as a longer-term career option, and he has now discovered a prosperous future in agriculture.

“Agriculture needs continuous effort,” he says. “With the support of technology, it is easy and efficient to work. I work every day so that I can reap crops on a large scale to make a profit. I manage weeds, irrigation, and control pests.”

“I also have livestock. I get adequate fodder for my cows and buffalo from weeds and from the spring maize. I sell milk in the market. In addition to this, I also make sure to produce off-season vegetables so that I receive a decent price for additional income.” With the support of his family, Morya has recently purchased an e-rickshaw, which he uses to transport and sell his produce.

To further support his endeavors, Morya has also been participating in Nepal’s Maize Commercialization Network and using the Geo Krishi mobile app to learn about current market prices. “Before knowing about the commercialization of crops, it was hard to receive good amounts from buyers,” he explains. “Now, I make a call to the local retailers and buyers to learn the best value of my grain. Sometimes I also explore the market. Then, I analyze the rate and sell my maize.” He uses a similar system for his off-season vegetables, selling either in the local market or directly to consumers for a premium price. “I make a saving of around 1500 Nepalese rupees (approximately US$ 11) per day,” he says.

A prosperous life

With the profits from his agricultural business, Morya has been able to fulfill his dream of purchasing a bike, as well as contributing to the construction of a new eight-room house, where his family is now living comfortably. “I love to roam on my bike with my friends in the evening. I also take my mother for a ride,” says Morya with a bright smile. “Now, I have a dream to live a prosperous life with my family.”

Morya fulfilled his dream of buying a bike. (Photo: CIMMYT)

Thanks to the support provided by the NSAF project with generous funding from USAID, young people like Morya can pursue a better life for themselves and their families. Agricultural training programs have not only helped young people fulfill their basic needs, but also to achieve their dreams. It is hoped that ongoing efforts to empower farmers through science and innovation will continue helping young farmers like Morya break the chain of unemployment, for both their own benefit and that of Nepal.