African Cassava Mosaic Disease: summary report
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Alaux, Jean-Pierre. 1990. African Cassava Mosaic Disease: summary report. CTA, Wageningen, The Netherlands
Permanent link to this item: http://hdl.handle.net/10568/63711
This work was prompted by a desire to bring to the attention of cassava growers, particularly in Africa, currently available information about of main discases of this crop.
African cassava mosaic virus (ACMV) is, adisease that is widespread throughout the African continent, where it occasions considerablelosses of tuber production. We must note that it is also rampant in Sri Lanka, and that in India the losses of productivity are estimatedto be at least 50%.The disease is still unknown in South America.The pathogen agent of cassava mosaic disease is a called African cassava mosaic virus (ACMV). This geminivirus grows in the cultivated varieties of cassava (Manihotesculenta), and in other Euphorbiaceae. in particular which is used as an plant, and in six species of cassava, one of which, Manihot vii, is present naturally. Experience shows thatthe role of these plants in contamination is minor and that is principal reservoir of the virus.isolates from cassava plantsfrom various regions of Africa and Indian subcontinent reveal the existence of three distinct groups. Group A (Angola. Ivory Coast, Nigeria, South Africa, and westernKenya), group B Kenya. Madagascar,and Malawi), and group C (India and Sri Lanka) coincide with the three routes by which cassava was ntroduced into Africa between the sixteenth and eighteenth centuriesthey support the hypothesis that when it was established the plant was contaminated by three variants of geminivirus which were endemic in the three geographic regions, and that the exchanges of cassavabetween these three regions have been very small in the past. or at least have not upset thebiological equilibrium.