Abstract Uncut ‘Pungo’ Irish potatoes (size B) were planted, 10-inch spacing in 3-ft rows on July 26, 1977. Treatment plots were replicated 4 times in a randomized block design. Each plot consisted of a single, 25-ft-long row bordered on each side by an untreated row. The sprays were applied with a D. B. Smith 5-gallon, knapsack, hand-operated, compressed-air sprayer at the rate of 100 gal/acre (40 psi) using a D. B. Smith #E-147 adjustable cone nozzle. Applications were made on August 17, 25, 31, September 7, 19, 28, October 5, 12, and 19. In evaluating the various insecticidal treatments, the number of potato beetle larvae, beet armyworms, and European corn borers were recorded/10 hills of potatoes. Efficacy against the tuberworms was determined by counting the total number of tuberworm mines/10 hills.