Breeding for Resistance to African Cassava Mosaic Disease: Progress and Prospects

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Jennings, D.L
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GERM PLASM derived from the former East African breeding program at Amani, Tanzania, is ,till the main source of resistance to African cassava mosaic disease (CMDl being used in breeding, and so it b useful to begin by restating the essential feature, of this program. It began in 1935 when H. H. Storey made a world-wide search for cultivars of M. esculenta resistant to CMD. He found some with a degree of resistance (e.g. F279 from Java which IS still favoured around Mombasa) and obtained higher resistance (e.g. 37244E) by intercrossing some of them. However. In general he concluded that even higher level, of resistance were needed and began to transfer resistance from other species, of Manihot by interspecific cropping and repeated back cropping to cassava: He used the following ,species: Tree species Manihot catingea Ule. (Jaquie Manicoba Rubber), Manihot catingea Ule. Tree cassava-believed to be a natural hybrid of M glaziovia and cassava. Herbaceous species; (taxonomy disputed by rogers and Appan, 1970) Manihot melanobasis Muell,-Arg and Manihot saxicola Lang.
East African Agricultural And Forestry Journal, p. 39-48