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Cassava diseases: ecology and control
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Cassava is an important crop in many parts of the tropics, but it plays a particularly vital role in sustaining food security in sub-Saharan Africa. Diseases are the greatest biotic constraint to cassava production worldwide. Although the diversity of cassava pathogens is greatest in Latin America, the greatest impacts have been reported from Africa. Most significantly, the dual cassava viral pandemics caused by cassava mosaic virus disease (CMD) and cassava brown streak disease (CBSD) have affected many of the major cassavaproducing countries in Africa, causing losses amounting to billions of dollars annually. Control programs have primarily focused on developing than deploying host plant resistance. Good sources of resistance are available for CMD and cassava bacterial blight (CBB), and germplasm improvement work is increasingly being strengthened through the development of molecular markers for marker-assisted breeding and transgenic approaches. Phytosanitary practices, mainly involving the selection of disease-free planting material and quarantine measures to avoid long-distance spread, have been widely used. New disease outbreaks in both Asia (CBB) and Africa (CBSD), however, highlight the need for continued vigilance in efforts to understand the ecology of cassava diseases and develop robust and sustainable management solutions.
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Permanent link to this itemhttps://hdl.handle.net/20.500.12478/1645
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Legg, J.P.; Kumar, P.L.; Kanju, E. (CABI Wallingford, 2015)Cassava 'brown streak' disease (CBSD) is an economically important constraint in important cassava-growing areas of East, Central and Southern Africa. In addition to causing a dry necrotic rot in the tuberous roots of infected plants, which can render them inedible, CBSD depresses yields through reducing plant growth. This pandemic of CBSD is driven by the high abundance of the whitefly vector, Bemisia tabaci, coupled with uncontrolled movements of infected cuttings used as planting material. This ...
The role of the whitefly, Bemisia tabaci (Gennadius), and farmer practices in the spread of cassava brown streak ipomoviruses Maruthi, M.N.; Jeremiah, S.C.; Mohammed, I.U.; Legg, J.P. (2017)Cassava brown streak disease (CBSD) is arguably the most dangerous current threat to cassava, which is Africa's most important food security crop. CBSD is caused by two RNA viruses: Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV). The roles of the whitefly Bemisia tabaci (Gennadius) and farmer practices in the spread of CBSD were investigated in a set of field and laboratory experiments. The virus was acquired and transmitted by B. tabaci within a short time (5–10 ...
Tripathi, L.; Ntui, V.O.; Tripathi, J.N.; Kumar, P.L. (2021)Viral diseases are significant biotic constraints for banana (Musa spp.) production as they affect the yield and limit the international movement of germplasm. Among all the viruses known to infect banana, the banana bunchy top virus and banana streak viruses are widespread and economically damaging. The use of virus-resistant bananas is the most cost-effective option to minimize the negative impacts of viral-diseases on banana production. CRISPR/Cas-based genome editing is emerging as the most ...