Abstract
Bemisia tabaci (Gennadius) populations were monitored in 1983 in the Imperial Valley of California on cotton and alfalfa utilizing yellow sticky traps and leaf samples. The influence of B. tabaci populations on cotton and early defoliation of cotton on autumn-planted crops was discussed. Infrared aerial photography was used as a survey tool to locate high whitefly densities in cotton. Insecticide resistance, adverse effects of pesticides on beneficial arthropods and different developmental rates on cultivated crops were factors that enhanced B. tabaci population increases.
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