Aphid Control on Spring Wheat with Foliar Applied Insecticides, 1983

‘Owens’ wheat was planted on 5 Apr., at Roswell, Idaho, in a furrow-irrigated field. Plots were 3 ft wide by 20 ft long and each was bordered by a 3-ft buffer strip that provided access. Treatments were arranged in a randomized complete block design. Sprays were applied on 16 Jul. with a CO2 pressurized hand held sprayer at 50 lb/in2 pressure and at a rate of 40 gal/acre. Wheat heads were in the early soft dough stage of development. Aphids were sampled by examining 20 tillers taken at random through the length of the plot. Yield estimates were made by hand harvesting heads from 10 row-ft per plot. The population consisted of 60% English grain aphids, 36% rose grass aphids and 4% other species. English grain aphids made up 96% of the total on heads; 86% of those on leaves were rose grass aphids.