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The levels of resistance in the wild species of cassava,  Manihot tristis  Muell-Arg. (Malpighiales: Euphorbiaceae), to the whitefly,  Aleurotrachelus socialis  Bondar (Hemiptera: Alelyrodidae), the most important economic pest in cassava,  Manihot esculenta  Crantz (Malpighiales: Euphorbiaceae) crops in South America, were estimated under glasshouse conditions. The parameters of the life history of  A. socialis  were studied on TST-26 and TST-18 accessions of the wild parent and compared with the susceptible (CMC-40) and resistant (MEcu-72) cultivars. The average longevity on the wild accessions (TST-26, 4.1; TST-18, 4.6 days) and oviposition rates (TST-26, 2.0; TST-18, 1.6 eggs/female/2 days) of the  A. socialis  females were not significantly different from those of MEcu-72 (5.1 days and 3.4 eggs/female/2days). The longevity and oviposition rates on CMC-40 were highest (11 days and 8.6 eggs/female/2days). Analyses of the demographic parameters (Ro, r m ; DT) showed a significant impact of the  M. tristis  accessions on the potential growth of  A. socialis.  The average survival time of adults that fed on TST-26, TST-18, and MEcu-72 were significantly different from those recorded on the susceptible genotype. Results from this study revealed important levels of resistance to the whitefly  A. socialis  on the TST-26 and TST-18 accessions due to the marked differences found for longevity and reproduction, which influenced and were consistent with the differences found in the net reproduction rate (Ro), intrinsic growth rate (r m ) and population doubling time (DT). The combined effect of these parameters indicated that  M. tristis  accessions were inappropriate hosts for  A. socialis.

Resistance to the Whitefly,Aleurotrachelus socialis, in Wild Populations of Cassava, Manihot Tristis