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Effects of cassava varietal mixtures on the whiteflies Aleurotrachelus socialis and Triateurodes variabilis in Colombia

The effects of cassava varietal mixtures on the population dynamics of the whiteflies Aleurotrachelus socialis Bondar and Trialeurodes variabilis (Quaintance) were investigated under outbreak conditions in Colombia. A regional variety of cassava (MCOL 2257) was grown in pure stand and mixed with a variety, CMC 40, believed to have partial resistance to T. variabilis. The dominant species in the systems, A. socialis, showed no varietal preference and population levels on the regional cultivar were similar between treatments. Of the two cultivars, CMC 40 was less preferred by T. variabilis and its presence in mixed variety plots lowered populations on the regional cassava. Yield losses, primarily due to A. socialis, were equal for regional cassava mixed with CMC 40 and in pure stand. Nevertheless, the use of CMC 40 in varietal mixtures provides a potential strategy for lowering herbivore load and increasing yields in zones with heavy T. variabilis attack.