Cereal Leaf Beetle and Aphid Control in Late-Planted Soft Red Winter Wheat, 1987

Abstract

Abstract Four insecticidal treatments were evaluated to determine their efficacy in controlling cereal leaf beetle and aphid population densities in soft red winter wheat. Foliar insecticides were applied on 11 May on ‘Pioneer 2551’ wheat planted on a 7-inch row spacing 10 Jan at Midway Farm in Richmond County, Va. Plots were 12 × 30 ft with a 3-ft alle> between treatments. Treatments were arranged in a randomized block design with 4 replications. Spray concentrates were applied with a C02-powered compressed-air sprayer at 32 psi that delivered 31.8 gal/acre by means of flat-fan Teejet AL8004 nozzels. The efficacy of individual treatments was determined 1, 3, 5, 7, and 14 days after application by inspecting whole plants for the presence of live cereal leaf beetle (CLB) larvae and aphids per row-ft. Yield estimates were obtained harvesting 9 30-ft-long rows from each plot with a small-plot combine. Yields were adjusted to 14% moisture. A Li-Cor LI3000 area meter was used to determine leaf areas of the flag and 2nd leaves and percent defoliation of 40 random plants/treatment.