{"id":13102,"date":"2026-06-20T12:26:24","date_gmt":"2026-06-20T12:26:24","guid":{"rendered":"https:\/\/dev.iita.org\/news-item\/scientists-alarmed-by-the-rapid-spread-of-cbsd-a-crop-that-sustains-300-million-africans\/"},"modified":"2026-06-20T12:26:24","modified_gmt":"2026-06-20T12:26:24","slug":"scientists-alarmed-by-the-rapid-spread-of-cbsd-a-crop-that-sustains-300-million-africans","status":"publish","type":"news-item","link":"https:\/\/iita.org\/fr\/news-item\/scientists-alarmed-by-the-rapid-spread-of-cbsd-a-crop-that-sustains-300-million-africans\/","title":{"rendered":"Scientists Alarmed by the Rapid Spread of CBSD, a Crop that Sustains 300 Million Africans"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><em>World\u2019s cassava experts to wage war against cassava viruses; Introduction into Nigeria, the largest cassava producer in the world, could result in drastic food shortages in this part of Africa<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cassava experts are reporting new outbreaks  and the increased spread of Cassava Brown Streak Disease or CBSD, warning that the rapidly proliferating plant virus could cause a 50 percent drop in production of a crop that provides a significant source of food  and income for 300 million Africans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The \u201cp andemic\u201d of CBSD now underway is particularly worrisome because agriculture experts have been looking to the otherwise resilient cassava plant\u2014which is also used to produce starch, flour, biofuel  and even beer\u2014as the perfect crop for helping to feed a continent where growing conditions in many regions are deteriorating in the face of climate change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cCassava is already incredibly important for Africa  and is poised to play an even bigger role in the future, which is why we need to move quickly to contain  and eliminate this plague,\u201d said Claude Fauquet, a scientist at the International Center for Tropical Agriculture (known by its Spanish acronym CIAT) who heads the Global Cassava Partnership for the 21st Century (GCP21). \u201cWe are particularly concerned that the disease could spread to West Africa  and particularly Nigeria\u2014the world\u2019s largest producer  and consumer of cassava\u2014because Nigeria would provide a gateway for an invasion of West Africa where about 150 million people depend on the crop.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fauquet  and his colleagues in the GCP21\u2014an alliance of scientists, developers, donors  and industry representatives\u2014are gathering at the Rockefeller Foundation Bellagio Center in Italy this week for a conference dedicated to \u201cdeclaring war on cassava viruses in Africa.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A \u201cSilent Killer\u201d Emerges: CBSD on Warpath from East to West<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First identified in 1935 in East Africa  and little-known until about ten years ago, CBSD has emerged as the most serious threat among the various cassava viruses. Infections can claim 100 percent of a farmer\u2019s harvest without the farmer\u2019s knowledge. The leaves of infected plants can look healthy even as the roots, cassava\u2019s most prized asset, are being ravaged underground. The tell-tale signs of the disease are brown streaks in the root\u2019s flesh that, when healthy, provides a rich source of dietary carbohydrates  and industrial starchy products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There have been recent reports of new outbreaks in the Democratic Republic of the Congo\u2014the world\u2019s third largest cassava producer\u2014 and Angola, where production has boomed in recent years. The spread of the disease to West Africa  and particularly Nigeria is a major cause for concern, experts say, because the country now produces 50 million tons of cassava each year  and has made a big bet on cassava for its agricultural  and industrial development in the near future.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nigeria is the first African country to massively invest in <a href=\"http:\/\/www.fao.org\/ag\/magazine\/0610sp1.htm\" target=\"_blank\" rel=\"noopener\">the potential of cassava<\/a> to meet the rapidly growing global dem and for industrial starches, which are used in everything from food products to textiles, plywood  and paper. Nigeria hopes to mimic the success of countries in Southeast Asia, where a cassava-driven starch industry now generates US$5 billion per year  and employs millions of smallholder farmers  and numerous small-scale processors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CMD\u2014a Scourge for Cassava on the African Continent<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Scientists at the conference will also consider options for dealing with another devastating virus\u2014the Cassava Mosaic Disease (CMD). CMD has plagued the whole African continent for over a century, each year removing a minimum of 50 million tons of cassava from the harvest.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The disease is caused by several viruses  and the African continent witnessed several major CMD epidemics over the past decades, the most recent  and devastating of which occurred in the 1990s in East  and Central Africa. Great success was achieved in combating the CMD p andemic through developing  and disseminating varieties that were resistant to CMD. In fact, by the mid-2000s, half of all cassava farmers were benefiting from these varieties in large parts of East  and Central Africa. But by a cruel twist of nature, both improved  and local varieties all succumbed to the \u2018new\u2019 p andemic of CBSD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Unexpected Plot Twist: Whiteflies Ambush a Climate-Resilient Crop<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Interest in cassava has intensified across Africa as rising temperatures  and shifting rainfall patterns caused by climate change threaten the future viability of food staples such as maize  and wheat. Cassava has been called the \u201c<a href=\"http:\/\/www.ciatnews.cgiar.org\/2012\/02\/27\/rambo-root-could-beat-climate-change-in-sub-saharan-africa\/\" target=\"_blank\" rel=\"noopener\">Rambo root<\/a>\u201d for its extraordinary ability to survive high temperatures  and tolerate poor soils. But rising temperatures now pose a threat to cassava because they appear to be one of several factors causing an explosion in whiteflies, which carry the viruses that cause CMD  and CBSD  and pass it along as they feed on the plant\u2019s sap.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compounding the effects of rising temperatures, scientists also think that genetic changes have led to the emergence of \u201csuper\u201d whiteflies. This toxic mix of circumstances affecting a tiny fly threatens to shoot down the \u201cRambo root,\u201d bringing the misery of food insecurity to vast swathes of Africa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cWe used to see only three or four whiteflies per plant; now we\u2019re seeing thous ands,\u201d said James Legg, a leading cassava expert at the International Institute of Tropical Agriculture (IITA). \u201cYou literally have a situation where human beings are competing for food\u2014with whiteflies.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Farmers also help spread the disease by planting new fields with infected stem cuttings. Scientists note that while it would take several years for the disease to spread across the continent via whiteflies alone, infected stem cuttings could spark outbreaks in new areas overnight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Experts to Develop Plan to Stop Viruses in their Tracks<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At the Italy meeting, experts will discuss a variety of tactics for combating virus diseases, such as developing more disease-resistant varieties like those recently released in Tanzania. Efforts to breed high-yielding, disease-resistant plants suitable for Africa\u2019s various growing regions will involve going to South America, where cassava originated,  and working with scientists to mine the cassava gene bank at CIAT in Colombia\u2014the biggest repository of cassava cultivars in the world.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The expert team will also discuss a more ambitious plan: how to eradicate cassava viruses altogether. The aim will be to develop a bold regional strategy that will gradually, step-by-step, village-by-village, replace farmers\u2019 existing infested cassava plants with virus-free planting material of the best  and most resistant available cultivars. Approaches will include new molecular breeding  and genetic engineering technologies to speed up the selection  and production of CMD  and CBSD resistant cassava cultivars more appealing to farmers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There also will be discussions about cost-effective  and environmentally sustainable ways to control whiteflies, as well as proposals for new surveillance systems that can better track  and stop the disease from spreading. Scientists will also discuss new research into the potential threat African cassava producers face from the introduction of new diseases currently found outside the continent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cIt\u2019s time for the world to recalibrate its scientific priorities,\u201d Fauquet said. \u201cMore than any other crop, cassava has the greatest potential to reduce hunger  and poverty in Africa, but CBSD  and other viruses are crippling yields. We need to treat CBSD  and other destructive viruses like the smallpox of cassava\u2014formidable diseases, but threats we can eradicate if everyone pulls together.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">###<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Founded in 2003, the <strong>Global Cassava Partnership for the 21st Century (GCP21)<\/strong> is a not-for-profit international alliance of 45 organizations  and coordinated by Claude Fauquet  and Joe Tohme of the International Center for Tropical Agriculture (CIAT). It aims to fill gaps in cassava research  and development in order to unlock the potential of cassava for improving food security  and also increasing incomes of poor farmers through work to develop industrial products from cassava. GCP21 is providing updated information regarding the crop, the scientists working on cassava  and cassava R&amp;D projects in the world.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le <strong>International Center for Tropical Agriculture (CIAT)<\/strong>\u2014a member of the CGIAR Consortium\u2014develops technologies, tools,  and new knowledge that better enable farmers, especially smallholders, to make agriculture eco-efficient\u2014that is, competitive  and profitable as well as sustainable  and resilient. Eco-efficient agriculture reduces hunger  and poverty, improves human nutrition,  and offers solutions to environmental degradation  and climate change in the tropics. With headquarters near Cali, Colombia, CIAT conducts research for development in tropical regions of Latin America, Africa,  and Asia. <a href=\"http:\/\/www.ciat.cgiar.org\/\" target=\"_blank\" rel=\"noopener\">www.ciat.cgiar.org<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le <strong>Institut International d'Agriculture Tropicale (IIAT)<\/strong> is a nonprofit research-for-development organization that works with partners in Africa  and beyond to tackle hunger  and poverty by reducing producer  and consumer risks, enhancing crop quality  and productivity,  and generating wealth from agriculture. IITA is a member of the CGIAR Consortium. <a href=\"https:\/\/iita.org\/fr\/\">www.iita.org<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Additional Institutions attending the Third Strategic Meeting of the Global Cassava Partnership for the 21st Century, Bellagio, Italy:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">International Potato Center (CIP), leader of CGIAR\u2019 Research Program on Roots, Tubers  and Bananas (RTB); CGIAR Fund; Food  and Agriculture Organization of the United Nations (FAO); International Fund for Agricultural Development (IFAD); World Bank; the African Development Bank (AfDB); United States Agency for International Development (USAID); Bill &amp; Melinda Gates Foundation; Syngenta Foundation for Sustainable Agriculture; Catholic Relief Services (CRS); Kenya Agricultural Research Institute (KARI); Mikocheni Agricultural Research Institute (MARI), Tanzania; Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (DSMZ), Germany; Natural Resources Institute (NRI), UK; Tel Aviv University, Israel; Institute of Resources Assessment (IRA), Tanzania; National Agricultural Crops Resources Research Institute (NACRRI), Ug anda.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pour plus d'informations, veuillez contacter :<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Michelle Geis<br>+1-301-280-5712<br><a>mgeis@burnesscommunications.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neil Palmer<br>+57 2 445 0000<br><a>n.palmer@cgiar.org<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>World\u2019s cassava experts to wage war against cassava viruses; Introduction into Nigeria, the largest cassava producer in the world, could result in drastic food shortages in this part of Africa&#8230;<\/p>","protected":false},"featured_media":12879,"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":[66],"impact-areas":[],"item-year":[191],"class_list":["post-13102","news-item","type-news-item","status-publish","has-post-thumbnail","hentry","crop-cassava","item-year-191"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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