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Eight commercial insecticides were applied topically to adult laboratory-reared boll weevils. Serial dilutions were applied to the ventral abdominal surface utilizing a Hamilton repeating dispenser fitted with a 50 μl syringe calibrated to deliver a 1 jxl droplet. Insects were 5-7 d adults obtained from the USDA-ARS Gast Rearing Facility, Mississippi State, MS. Following topical application, weevils were placed in petri dishes, held at constant temperature (28°) and humidity (70-74%), at a 12 h light phase. Mortality was recorded after 24, 48, and 72 h. Mortality estimates LD50 were based on a minimum of four doses per in-secticide. Three replicates of 30 weevils each were treated. Dose-mortality data were analyzed by probit analysis. When necessary, control mortality was corrected using Abbott’s formula.

Dose-Mortality Response of the Cotton Boll Weevil to Selected Insecticides, 1995