Abstract
Abstract Five insecticides were evaluated to determine their efficacy in controlling English grain aphid. Insecticides were applied 18 Jun to soft white spring wheat (milky-ripe stage of growth) grown on the Washington State University, Irrigated Agriculture Research and Extension Center, Prosser, WA. Treatments were applied with a hand-held sprayer calibrated to deliver 43 gpa at 40 psi. Temperature at the time of treatment was 72°F. A total of 0.9 and 0.08 in rain was received 27 and 29 Jun, respectively. Plots were 3 x 28 ft, replicated 4 times in a randomized complete block design. Treatments were evaluated on the total aphids present/10 randomly selected wheat heads from each plot at pre-treatment and at several post-treatment intervals.
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