Abstract
Abstract Certified B-size potatoes were planted 21 May at the University of Minnesota Agricultural Experiment Station, Rosemount. The field, a Waukegan silt loam, had been in soybeans the previous year. Treatments were 2 rows, 40 ft long with 40-inch row spacing. Treatments were randomized in complete blocks with 4 replications. Granular insecticides were applied at planting in furrow with a planter-mounted granular applicator and at emergence over the rows on 2 Jul and sidedressed on 23 Jul. An additional treatment consisted of 3 foliar sprays of Pydrin at 0.1 lb/acre on 16 Jul, 15 Aug, and 30 Aug. Plots were evaluated by counting CPB larvae by instar on 10 randomly selected plants in each plot on 7 Jul, 28 Jul, 11 Aug, 18 Aug, 23 Aug, 31 Aug, and 9 Sep. Plots were also evaluated for PLH by sampling 35 mid-plant leaves in each plot. Temik and Thimet plots were not sprayed with any foliar insecticide. On 15 Oct potatoes were harvested and sorted by grade. Two-way ANOVA was used to test for treatment differences in PLH and CPB densities.
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