Foliar Insecticides for Control on Potato, 1987:

Certified B-size potatoes were planted 20 May at the University of Minnesota Experimental Station, Rosemount. Experimental plots were 25 ft long with 40-inch row spacing. Treatments were randomized in complete blocks with 3 replications. Insecticide sprays were applied once with a CO2-powered hand sprayer delivering 36 gal/acre. CPB populations were very high. All treatments resulted in significantly fewer CPB larvae on 29 and 31 Jul compared with the untreated control, and all treatments except 6 qt Trident + 1 qt Nu-film resulted in significantly fewer larvae on 2 Aug. Plots were sprayed 26 Jul and counted 29 Jul, 31 Jul, and 2 Aug. Evaluations consisted of total counts of all second and third instars on 10 randomly selected plants from each plot. The percentage of rating control was based on comparison to mean CPB numbers in the 3 untreated control plots and corrected by Abbott’s formula. Control ranged from 30.3 to 100%.