Green Peach Aphid Control, 1978

Abstract

Abstract ‘U & I Hybrid 8’ sugarbeets were planted Apr 2‘78, in Ashue, AridisArgixerolls, loam near Toppenish, WA. Plots were 6-rows wide (22-in. apart) and 100-ft long. The two treatments were replicated 5 times in a randomized complete block design. For the first treatment, a granular insecticide was sidedressed (1 in. wide band) 1.5 in. from seed and 2 in. deep on one side of a row at planting time with a tractor-drawn, belt-type applicator. The second treatment consisted of two foliar sprays followed by an application of the granular insecticide. The foliar sprays were applied May 1 and 15 when the plants were in the cotyledon 2-leaf and 2- to 4-true leaf stage, respectively. This application was made with a bicycle-type, 6 row portable boom, CO2 pressurized sprayer at the rate of 19 gal/acre. Ortho X-77 spreader was used with the foliar spray. The granular insecticide was applied Jun 12, when beets were in the 8-10 true leaf stage, by dribbling previously weighed amounts of insecticide granules into the beet crowns through a hand-operated funnel-type applicator. In all plots, the same 10 plants in each plot were examined for insects on 6 dates. Three yellow water trap pans near the test site indicated that the initial alate green peach aphid (GPA) activity occurred the 2nd week of Apr. The field was rill irrigated.