Wireworm Control on Potato, 1988:

Abstract

Abstract Certified B-size potatoes were planted 23 May at the University of Minnesota Agricultural Experiment Station, Rosemount. The field, a Waukegan silt loam, had been in alfalfa the previous 3 yr. Treatments were 2 rows, 120 ft long, with 40-inch row spacing. Treatments were randomized in complete blocks with 5 replications. Granular insecticides were applied in furrow with a planter-mounted granular applicator. An untreated control was planted between every 2 insecticidal treatments. The plots were not sprayed with any foliar insecticide. On 1 Oct potatoes were harvested, counted, and scored for wireworm injury. Control for each treatment was calculated as the percentage of reduction in wireworm damage relative to the adjacent untreated control. The granular insecticides also were evaluated for nontarget species on 27 Jun, 6 Jul, 18 Jul, 28 Jul, 5 Aug, 11 Aug, and 23 Aug. Plots were sampled for PLH and PFB by counting 35 mid-plant leaves. CPB larvae were counted by instar on 20 randomly selected plants in each plot.