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With research staff from more than 60 countries, and offices across the globe, IFPRI provides research-based policy solutions to sustainably reduce poverty and end hunger and malnutrition in developing countries.

researcher spotlight

Eliot Jones-Garcia

Eliot Jones-Garcia is a Senior Research Analyst with the Natural Resources and Resilience Unit based in Washington, DC. His research focuses on human-AI interaction, user-centered design, and the ethical and responsible development of AI. Eliot is currently finalizing a PhD on the digitalization of agricultural advisory services at Wageningen University & Research.

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Innovation Policy and Scaling

Patricia Zambrano

Senior Program Manager

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Patricia Zambrano is a Senior Program Manager in the Innovation Policy and Scaling Unit. She works on themes related to the economic evaluation of biotechnologies and their regulation. Previously she supported work on gene bank evaluation, genetic resources, biodiversity, intellectual property rights, R&D expenditures, and other related themes.

Patricia holds an undergraduate degree in Economics from the Universidad de Los Andes in Bogotá, Colombia, and pursued postgraduate studies at the same institution. Additionally, she earned a master’s degree in economics from the University of California, Davis.

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Publications

Resource thumbnail

Working Paper

Insecticide use, farmers’ self-reported health status, and genetically modified cowpea in Nigeria: Findings from a clustered randomized controlled trial with causal

2025Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Nwagboso, Chibuzo; Zambrano, Patricia; Chambers, Judith A.
Details

Insecticide use, farmers’ self-reported health status, and genetically modified cowpea in Nigeria: Findings from a clustered randomized controlled trial with causal

Excessive insecticide use in smallholder agriculture can threaten human health and the environment. We evaluate the effects of receiving a genetically modified cowpea variety that confers resistance to the legume pod borer (Maruca vitrata) using a clustered randomized controlled trial with an encouragement design in Nigeria. We find that farmers who received the pod borer-resistant (PBR) cowpea with complementary inputs significantly reduce insecticide volumes and report fewer days of insecticide-related illness compared to farmers who only received a conventional cowpea variety. Farmers receiving PBR cowpea alone experience smaller, mostly insignificant reductions. To explore heterogeneous responses, we combine ANCOVA (analysis of covariance) interactions with machine learning-based Causal Forest estimates of Conditional Average Treatment Effects (CATEs). Results reveal that smaller, less wealthy, and labor-constrained households experience the largest reductions in insecticide use and health improvements, whereas wealthier farmers or those with higher baseline spraying practices experience lower reductions. Women-managed plots exhibit modestly higher responsiveness. Our findings highlight the importance of moving beyond average effects and seed distribution toward targeted, context-specific interventions that account for behavioral and resource constraints in smallholder farming systems.

Year published

2025

Authors

Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Nwagboso, Chibuzo; Zambrano, Patricia; Chambers, Judith A.

Citation

Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Nwagboso, Chibuzo; et al. 2025. Insecticide use, farmers’ self-reported health status, and genetically modified cowpea in Nigeria: Findings from a clustered randomized controlled trial with causal. IFPRI Discussion Paper 2388. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/179030

Country/Region

Nigeria

Keywords

Africa; Sub-saharan Africa; Western Africa; Insecticides; Farmers; Health; Genetically Modified Foods; Cowpeas; Randomized Controlled Trials; Machine Learning

Language

English

Access/Licence

Open Access

Source

Source record

Project

National Policies and Strategies

Record type

Working Paper

Resource thumbnail

Working Paper

The impact of genetically modified cowpea on yields, postharvest losses, and profitability in Nigeria: Findings from a cluster randomized controlled trial

2025Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Zambrano, Patricia; Chambers, Judith A.; Fasoranti, Adetunji; Popoola, Olufemi
Details

The impact of genetically modified cowpea on yields, postharvest losses, and profitability in Nigeria: Findings from a cluster randomized controlled trial

We assess the impacts of a genetically modified pod borer-resistant (PBR) cowpea variety in Nigeria through a cluster randomized controlled trial conducted in two major cowpea-cultivating states. Our design allows us to examine the impacts of PBR cowpea with and without a package of complementary inputs (fertilizer and insecticides) and in comparison to farmers who received only a conventional improved cowpea variety. Results indicate that farmers who received and planted PBR cowpea experienced significant increases in yield (21 percent) and net margins (49 percent) compared to those growing the conventional variety, with larger gains observed among those provided with the inputs package. Analysis of heterogeneous effects indicates substantial variation in outcomes based on baseline characteristics such as household size, landholding, pest control practices, and wealth. Estimation of group average treatment effects and classification analysis using a causal machine learning approach identify plot size, pesticide use, and assets as key drivers of impact heterogeneity. Findings highlight the need for targeted dissemination strategies to realize the sizable benefits of PBR cowpea for small-scale, resource-constrained farmers.

Year published

2025

Authors

Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Zambrano, Patricia; Chambers, Judith A.; Fasoranti, Adetunji; Popoola, Olufemi

Citation

Amare, Mulubrhan; Andam, Kwaw S.; Spielman, David J.; Bamiwuye, Temilolu; Zambrano, Patricia; et al. 2025. The impact of genetically modified cowpea on yields, postharvest losses, and profitability in Nigeria: Findings from a cluster randomized controlled trial. IFPRI Discussion Paper 2383. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/178553

Country/Region

Nigeria

Keywords

Africa; Sub-saharan Africa; Western Africa; Impact; Genetically Modified Organisms; Seed Damaging Insects; Pest Resistance; Cowpeas; Randomized Controlled Trials; Machine Learning; Smallholders; Information Dissemination; Yields; Postharvest Losses; Profitability

Language

English

Access/Licence

Open Access

Source

Source record

Project

National Policies and Strategies

Record type

Working Paper

Resource thumbnail

Working Paper

A good global investment for the United States: How investing in CGIAR makes America stronger, safer and more prosperous

2025
Hill, Ruth Vargas; McNamara, Brian; Ringler, Claudia; Spielman, David J.; Thurlow, James; Berrospi, Maria Lucia; Chambers, Judith A.; Falck-Zepeda, José B.; Gilligan, Daniel O.; Glauber, Joseph W.
…more Hernandez, Manuel A.; Headey, Derek D.; Hoffmann, Vivian; Kosec, Katrina; Martin, Will; Nia, Reza; Nin-Pratt, Alejandro; Piñeiro, Valeria; Takeshima, Hiroyuki; Vos, Rob; Zambrano, Patricia; Zhang, Wei
Details

A good global investment for the United States: How investing in CGIAR makes America stronger, safer and more prosperous

This report documents how CGIAR investments have delivered substantial economic, security, and diplomatic benefits for the U.S. that far exceed financial contributions. By driving agricultural innovation and providing evidence-based insights, CGIAR has boosted U.S. farm productivity, expanded export markets, and made food more affordable for American consumers. It has also helped prevent billions of dollars in potential damage from pests and diseases that threaten U.S. food security and farm livelihoods. CGIAR promotes American leadership in agricultural innovation by supplying the majority of the genetic materials used in U.S. crop breeding and acting as a critical research partner for U.S. businesses and universities. CGIAR also makes America safer and stronger through its work on predicting crises, protecting food security, and on improving livelihoods as an alternative to migration.

Year published

2025

Authors

Hill, Ruth Vargas; McNamara, Brian; Ringler, Claudia; Spielman, David J.; Thurlow, James; Berrospi, Maria Lucia; Chambers, Judith A.; Falck-Zepeda, José B.; Gilligan, Daniel O.; Glauber, Joseph W.; Hernandez, Manuel A.; Headey, Derek D.; Hoffmann, Vivian; Kosec, Katrina; Martin, Will; Nia, Reza; Nin-Pratt, Alejandro; Piñeiro, Valeria; Takeshima, Hiroyuki; Vos, Rob; Zambrano, Patricia; Zhang, Wei

Citation

Hill, Ruth; McNamara, Brian; Ringler, Claudia; Spielman, David; Thurlow, James; Berrospi, Maria Lucia; et al. 2025. A good global investment for the United States: How investing in CGIAR makes America stronger, safer and more prosperous. IFPRI Working Paper. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/176753

Country/Region

United States

Keywords

Americas; Northern America; Economic Aspects; Finance; Agricultural Innovation; Exports; Markets; Food Security; Research

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Record type

Working Paper

Events

ICTforAg 2024: Localizing impact
IFPRI at External Event

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May 28, 2024, 9:00 – 5:00 pm

ICTforAg 2024: Localizing impact

Event: May 28, 2024 – 9:00am to 5:00pm EDT. This event explores the localization of ICT, responsible AI in agriculture, the potential for AI to increase farm profitability, empowering citizen science, and harnessing digital solutions for sustainable and regenerative farming practices.

2018 International Consortium on Applied Bioeconomy Research Conference (ICABR)
IFPRI at External Event

 | 

June 12 to 15, 2018

2018 International Consortium on Applied Bioeconomy Research Conference (ICABR)

IFPRI is participating extensively in the International Consortium on Applied Bioeconomy Research (ICABR) conference. Multiple changes in the structure of the food system and agriculture raise new opportunities and challenges for the agricultural sector.  In the developing world, these changes started in Asia and Latin America, and are rapidly emerging in Africa.  Urbanization and increased urban […]