Abstract
Four cassava cultivars [''Aipin Valenca'', ''46106/27'', ''5318/34'' and ''N Mex 55''] from different sources [Manihot esculenta, M. glaziovii and hybrids] were evaluated in the screenhouse for resistance to cassava mosaic virus. Test plants were exposed to 1-15 viruliferous whiteflies (B. tabaci). The virus was transmitted by single whiteflies, but percent transmission increased with the number of insects per plant. The cultivars from South America were highly susceptible to the disease. A technique for quick screening of cassava for mosaic resistance is suggested.

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