Abstract
Abstract Formulated biological insecticides were evaluated for toxicity to lepidopterous pests of cotton in the laboratory. Bioassays were conducted by applying insecticides to cotton terminals (‘STV 213’) held in water pics using a laboratory spray table. The spray table was calibrated to deliver 6 gal/acre at 2 mph with 30 psi at one TX6 nozzle. Each treatment consisted of 3 replicates of 15 terminals/replicate. Controls were treated with water only. Laboratory strains of each insect were reared on artificial diet and each species was tested separately. The average weight of insects tested in mg was: TB, 6.5 ± 1.4; BW, 9.2 ± 2.7; BA, 6.9 ± 1.6; SL, 8.3 ± 1.8. One larva was placed on each terminal 30 min after spraying and held under ventilated cups at 85°F and 55-60% RH. Mortality was determined 72 h after treatment. Mortality was corrected for control mortality by Abbott‘s formula. Data were transformed to arcsin J for analysis; actual percent mortalities are shown.
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