Potato Insect Control by Soil-Applied Systemic Insecticides, Freeville, New York, 1978

‘Katahdin’ potatoes were planted May 31 ‘78, in Phelps gravelly silt loam soil at a spacing of 9-12 inches within the row. Individual plots were 1-row wide, 40-ft long, with 36-inch-row spacing, separated by 2 skip rows. A randomized complete block of 4 replications was used. Fertilization was by 1000 lbs/A of 15-15-15 NPK in 2 in-row side bands at planting. Granular EPTC was applied at 6.0 lb ai/A on Jul 11 ‘78. Chlorothalonil at 1.1 lbs ai/A was used at weekly intervals for control of late blight. Plots were not irrigated. All insecticide treatments were applied on May 31 ‘78 in a 4 inch band in the seed furrow using a Craftsman cone-seeder. Sampling of aphids was by the leaf-sample method; 1 fully-expanded compound leaf was taken from the upper 1/2 and lower 1/2 of each of 10 randomly selected plants/plot. Sampling of other pests was by the D-vac vacuum method; samples were taken from 10 randomly selected sites/plot, with 3 bounces/site. Raw data were transformed [log 10 (x + O.l)] as necessary prior to statistical analysis.