The feeding behavior of the potato leafhopper, Empoasca fabae (Harris), on Chlordimeform- and phosmet-treated alfalfa, Medicago sativa (L.), was investigated using an alternating current electronic monitoring system. Feeding of adult female leafhoppers was recorded on alfalfa stems dipped in 100-ppm chlordimeform or phosmet emulsions and compared with that on stems dipped in a control solution of acetone plus surfactant. The potato leafhopper normally feeds by making numerous short duration probes, which consist of one or more distinctive feeding patterns. The presence of chlordimeform and phosmet on alfalfa stems significantly reduced probing frequency and total probing duration. However, on chlordimeform-treated alfalfa, the duration of individual probes was significantly longer. The individual probes of chlordimeform-exposed leafhoppers were significantly longer during the first 30 min of exposure, suggesting that chlordimeform interferes with processes that are responsible for probe initiation and termination. Phosmet treatment resulted in 25% mortality and other symptoms of toxicity after 120 min of exposure.
Document Type: Research Article
Publication date: June 1, 1989
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