Control of First-Generation European Corn Borer, 1987

Abstract

Performance of liquid insecticides applied to foliage was evaluated in small plot trials on pretassel corn near Crookston, Minn. Plots of 2 rows (5 ft) by 50 ft were established 10 Jul in a commercial field planted 4 May. Treatments were arranged in a randomized complete block design with 4 replicates. Insecticides were applied with a CO2-powered backpack sprayer delivering 17 gal water/acre through Zytel LF-3-80 nozzles at 40 psi. Light winds (<2 mph) and warm temperatures (89°F) prevailed during application, but IV2 inches of rain began to fall within 6 h after application. Insecticide performance was evaluated 19 Aug by dissecting 10 plants/plot and counting all damage sites (tunnels in stalk, ear shank, and ear).