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Topical application tests were conducted to determine the toxicities of 10 insecticides to 6th instar western spruce budworm. Insects were randomly selected from the 82nd generation of a nondiapausing laboratory colony. Eight concentrations of each chemical were serially diluted from a concentrated source prepared for each of three replications of each experiment. Each chemical was applied in reagent grade acetone. Treatment- was performed with an ISCO model M microapplicator equipped with a 0.25 cc tuberculin syringe. A dosage rate of 1 jul/100 mg body weight was used to apply the insecticide to the thoracic dorsa of CO2-anesthetized larvae weighing 60-120 mg. After treatment, larvae were fed artificial diet. Mortality was tallied 7 days after treatment.

Toxicities of Topically Applied Insecticides To Western Spruce Budworm, 1979