Abstract
Abstract ‘Gemchip’ potatoes were planted 8 Jun at the Fry Farm, OARDC, Wooster, OH. Plant spacing was 36 inches between rows and 9 inches between plants. Fertilizer was applied at planting (1750 lb/acre 10-20-20). The Admire 2F soil treatment was applied at planting using a CO2 compression sprayer at 40 psi with a 8004 flat fan nozzle delivering the insecticide into the seed furrow. The field was treated on 7 Jun with 0.75 lb/acre of Sencor DF. Fungicide, Dithane at 2.0 lb/acre, was applied 12, 19, 26 Jul, 3, 18, 26 Aug, 2 Sep, and Penncozeb at 2.0 lb/acre was applied 10 Aug. Paraquat, lpt/acre, was applied 21 Sep as a vine killer. Plots were two rows wide and 50 ft in length, with 12 ft alleys separating plots and 6 ft alleys separating blocks. Treatments were arranged in a randomized complete block design. Foliar treatments initiated when the first generation larvae were increasing in the plots were applied 12 and 26 Jul with a tractor mounted drop nozzle boom sprayer delivering 50 gal/acre at 50 psi with three D-4 hollow cone nozzles/row. Number of eggs, small (instar 1-2), large (instar 3-4) larvae, and adults were counted and percent defoliation was visually estimated in five 1-m lengths of row per plot weekly. PLH nymphs were sampled by visually inspecting 5 compound leaves per plot. Potatoes were harvested 10 Oct with all grading finished by 12 Oct.
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