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Evaluation of Insecticides for Control of Alfalfa Weevil Larvae, 1986


 The efficacy of 7 insecticides for the control of alfalfa weevil larvae was tested at the Southwest Kansas Branch Experiment Station near Garden City, KS. Plots measuring 3.6 m X 9.0 m were arranged in a randomized complete block design with 4 replications. Treatments were applied on 11 Apr when alfalfa was 25.4 cm tall. Insecticides were applied using a C02-activated, 1.8 cm boom sprayer fitted with hollow-cone nozzles (6x) centered on 48.3 cm. All treatments were applied at a pressure of 2.1 kg/cm2 and at a rate of 165.5 liters/ha. Temperature at application (early morning) was 10.0°C. Larval densities were determined from 20 stems randomly selected from each plot on each of 4 sampling dates. Larvae were extracted from the foliage by shaking the plant stems against the side of a white plastic bucket prior to counting. Total rainfall from the time of application to final posttreatment evaluation was 1.50 cm.