Toxicities of Topically Applied Insecticides To Western Spruce Budworm, 1979

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.