{"id":13032,"date":"2026-06-20T12:26:13","date_gmt":"2026-06-20T12:26:13","guid":{"rendered":"https:\/\/dev.iita.org\/news-item\/researchers-and-farmers-begin-effort-to-reduce-crop-loss-from-striga-attacking-africas-crops\/"},"modified":"2026-06-20T12:26:13","modified_gmt":"2026-06-20T12:26:13","slug":"researchers-and-farmers-begin-effort-to-reduce-crop-loss-from-striga-attacking-africas-crops","status":"publish","type":"news-item","link":"https:\/\/iita.org\/fr\/news-item\/researchers-and-farmers-begin-effort-to-reduce-crop-loss-from-striga-attacking-africas-crops\/","title":{"rendered":"Researchers and farmers begin effort to reduce crop loss from Striga attacking Africa’s crops"},"content":{"rendered":"

New project to generate an additional US$8.6 million annually, 50% higher yields for farmers across Kenya and Nigeria<\/em><\/p>\n\n\n\n

Scientists based in Nigeria and Kenya have begun a major push against parasitic weeds that have spread across much of sub-Saharan Africa, causing up to US$1.2 billion in damage every year to the maize and cowpea crops of tens of millions of small farmers.<\/p>\n\n\n\n

The project, coordinated by the Nigeria-based International Institute of Tropical Agriculture (IITA), will introduce proven technologies for fighting Striga<\/em>, or witchweed, and Alectra<\/em>. Known by some as the \u201cviolet vampire\u201d because of its bright purple color, Striga attaches itself to the roots of plants like maize and cowpea and sucks out nutrients, reducing yields and destroying entire harvests.<\/p>\n\n\n\n

Witchweed primarily affects smallholder farmers who can\u2019t afford costly herbicides for fighting the parasitic plant. The most widespread Striga<\/em> species is estimated to have infested up to 4 million hectares of l and under maize production in sub-Saharan Africa, causing yield losses of up to 80 percent. According to researchers at IITA, this represents up to $1.2 billion in losses for farmers and affects approximately 100 million people in sub-Saharan Africa.<\/p>\n\n\n\n

The parasitic weeds have spread widely in Africa in recent decades; their prolific seeds germinate in response to substances released by the roots of crop plants. Because crop plants have more difficulty competing with witchweed in poor soils, intensive farming and the expansion of farming into marginal soils have encouraged their spread. Furthermore, witchweed is difficult to control because each plant produces up to half a million seeds that can remain dormant in the soil for decades.<\/p>\n\n\n\n

\u201cAfrica is plagued by a plant \u2018vampire\u2019 that robs farmers of their harvest,\u201d said Hartmann, IITA director general. \u201cDedicated pursuit by farmers and researchers is delivering several ways to fight the parasite.\u201d<\/p>\n\n\n\n

The $9.0 million Striga<\/em> project is supported by a $6.75 million grant from the Bill & Melinda Gates Foundation to IITA. Its goal is to help 200,000 maize farmers and 50,000 cowpea farmers who work in areas with high rates of Striga<\/em> infestation in Kenya and Nigeria. By project\u2019s end in 2014, organizers estimate that over 250,000 individual farmers will potentially see up to 50% higher maize yields and 100% higher cowpea yields.<\/p>\n\n\n\n

The four-year project will focus on improving and exp anding access to methods of Striga<\/em> control, while supporting research to identify the most effective means of controlling the parasitic weed under varying conditions. The project will evaluate and implement four approaches: using Striga<\/em>-resistant crop varieties; using a \u201cpush-pull\u201d technology that involves intercropping with specific forage legumes that inhibit the germination of Striga<\/em>; using herbicide-coated seeds; and deploying biocontrol of Striga<\/em>. After a two-year evaluation period, the project will scale up the most effective approaches.<\/p>\n\n\n\n

Project partners include the International Maize and Wheat Improvement Center (www.cimmyt.org<\/a>), African Agricultural Technology Foundation (www.aatf-africa.org<\/a>), International Centre of Insect Physiology and Ecology (www.icipe.org<\/a>), and BASF Crop Protection.<\/p>\n\n\n\n

Scientists expect that the integrated witchweed control interventions will generate an estimated $8.6 million worth of additional grain (maize and legumes) annually at the project locations\u2014resulting in increased incomes, better nutrition, and reduced poverty, as well as employment opportunities from grain production to food markets.<\/p>\n\n\n\n

The project will work with farmers, seed companies, community-based organizations, extension workers, policymakers, and researchers. In pilot areas, it will supply witchweed-resistant maize and legume seed and chemically treated seed to private seed companies and community-based seed producers for production and distribution.<\/p>\n\n\n\n

\u201cMost farmers in the Striga<\/em> Project target areas are highly resource-poor. The Project aims to integrate delivery of Striga<\/em>-resistant maize and legume seeds with best-bet agronomic technologies to fight the weed menace, while raising farmers\u2019 awareness of the technologies, and supporting community-based organizations with technical assistance,\u201d said Prasanna Boddupalli, director of the Global Maize Program of CIMMYT, based in Nairobi, Kenya.<\/p>\n\n\n\n

The project will also research new management techniques such as use of a biological control method. Biocontrol can help maintain the balance of nature, support biodiversity, and sustain complex and beneficial ecological interactions.<\/p>\n\n\n\n

In addition, the project will provide lessons and strategies for scaling up in other areas of sub-Saharan Africa, where witchweed is a major problem for maize and cowpea production. The project will also generate scientific data on the biology of witchweed, including the plant\u2019s relationship with different hosts and methods for rapid screening for resistance to the weed in maize and other crops.<\/p>\n\n\n\n

Each of the approaches to control Striga<\/em> holds promise, especially when two or more options are employed at the same time. For example, in West Africa, IITA and partners have tested the combined use of Striga<\/em>-resistant maize varieties in rotation with legumes that cause witchweed seeds to germinate but fail to latch on to the host. This approach increased crop productivity by an average of 88 percent.<\/p>\n\n\n\n

In East Africa, icipe<\/em> and partners have developed a novel cropping system, known as \u201cpush-pull.\u201d It is an environmentally-friendly, economical approach that inhibits witchweed, and attracts insect pests to trap plants (pull) while driving them away from the main crop using a repellent intercrop (push).<\/p>\n\n\n\n

\u201cIncreased uncertainty about the continent\u2019s vulnerability to climate change and its spin-off effects on parasitic weeds like Striga<\/em> have created more dem and for \u2018push-pull.\u2019 Farmers need more weapons in the fight against these threats,\u201d said Christian Borgemeister, director general of icipe<\/em>. \u201cOur partnership is a good example of donors and researchers responding to the needs of farmers by enabling their ability to withst and the increasingly adverse and highly-variable weather and other constraints at the farm level.\u201d<\/p>\n\n\n\n

Approximately 80 percent of the population in sub-Saharan Africa depends on agriculture for food, income, and employment. However, average yields of maize and cowpea are very low. Approximately 300 million people live below the poverty line in the region, and in rural areas, roughly half the population encounters hunger and malnutrition.<\/p>\n\n\n\n

###<\/strong><\/p>\n\n\n\n

Pour plus d'informations, veuillez contacter :<\/strong>
Jeff Haskins at +254 729 871 422 or jhaskins@burnesscommunications.com<\/a>
Jeffrey Oliver at +234 806 319 0480 or o.jeffrey@cgiar.org<\/a><\/p>\n\n\n\n

\u00c0 propos de l'IITA<\/strong> (www.iita.org<\/a>)
L'Afrique fait face \u00e0 des probl\u00e8mes complexes qui p\u00e8sent sur l'agriculture et la vie des populations. Nous d\u00e9veloppons des solutions agricoles avec nos partenaires pour lutter contre la faim et la pauvret\u00e9. Nos recherches pour le d\u00e9veloppement (R4D), maintes fois r\u00e9compens\u00e9es, reposent sur une r\u00e9flexion cibl\u00e9e et autoris\u00e9e, ancr\u00e9e dans les besoins de d\u00e9veloppement de l'Afrique subsaharienne. Nous collaborons avec des partenaires en Afrique et au-del\u00e0 pour r\u00e9duire les risques pour les producteurs et les consommateurs, am\u00e9liorer la qualit\u00e9 et la productivit\u00e9 des cultures, et g\u00e9n\u00e9rer de la richesse gr\u00e2ce \u00e0 l'agriculture. L'IITA est une organisation internationale de R4D \u00e0 but non lucratif cr\u00e9\u00e9e en 1967, r\u00e9gie par un Conseil d'administration et soutenue principalement par le CGIAR.<\/p>\n\n\n\n

Striga Management Project<\/strong>
Related press releases<\/p>\n\n\n\n

English: http:\/\/basf.com\/group\/news- and-media-relations\/press-releases<\/a>
German: http:\/\/basf.com\/group\/presse\/press-releases<\/a><\/p>","protected":false},"excerpt":{"rendered":"

New project to generate an additional US$8.6 million annually, 50% higher yields for farmers across Kenya and Nigeria
\nScientists based in Nigeria and Kenya have begun a major push against parasitic weeds that have spread across much of sub-Saharan Africa, causing up to US$1.2 billion in damage every year to the maize and cowpea crops of tens of millions of small farmers…<\/p>","protected":false},"featured_media":13003,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"tags":[],"science-area":[],"program":[],"location":[],"news-type":[],"hub":[],"crop":[68],"impact-areas":[],"item-year":[189],"class_list":["post-13032","news-item","type-news-item","status-publish","has-post-thumbnail","hentry","crop-maize","item-year-189"],"yoast_head":"\nResearchers and farmers begin effort to reduce crop loss from Striga attacking Africa's crops - 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