Abstract
Colonization by high densities of sweetpotato whitefly, Bemisia tabaci, B-biotype, reduced growth of lettuce (Lactuca sativa) and kai choy (Brassica campestris). A 41% reduction in the weight of lettuce plants resulted when they were colonized by 200 adult whiteflies and their offspring for 3 wk. The weight of kai choy plants was reduced 14 and 21% when they were colonized by 100 and 200 adult whiteflies and their offspring, respectively, for 3 wk. In contrast, colonization by 10, 50, and 100 whiteflies and their nymphs per lettuce plant, or 10 and 50 whiteflies plus their nymphs per kai choy plant, did not reduce growth significantly
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