Control of Green Peach Aphid on Potato, 1997

Abstract

Abstract Potatoes were planted 19 May at the University of Minnesota Agricultural Experiment Station, Rosemount, MN. Treatments were replicated sixteen times in a completely randomized design. Plots were 8 rows (36-inch row spacing) wide by 30 ft long with 12-ft alleyways separating plots. On 8 Aug, a pre-treatment count was made and all treatments were applied on 9 Aug. Treatments were applied with a tractor-mounted boom sprayer delivering 45 gpa at 90 psi with three nozzles per row. Plots were treated with Asana or Methoxychlor every 7 days beginning at late June to enhance the aphid population and to control potato leafhopper. Early and late blight were controlled by weekly applications of chlorothalonil or mancozeb. Thirty-five midplant leaves were sampled from the center four rows of each plot on each sample date.