Budworm Control on Sweet Corn, Winter, 1983

Abstract

Abstract Sweet corn was planted 26 Oct in Myakka fine sand on the University of Florida’s Central Florida Research and Education Center in Sanford. Lasso 15G 3 lb (AI)/acre was incorporated in a 15 inch band at planting time for weed control. Treatments were applied to single row, 40-ft plots with 12-inch plant spacing. Rows were spaced 5 ft apart. Treatments were replicated 5 times in randomized complete blocks separated by 10 ft weed-free alleys. Sprays were applied with a CO2 pressurized sprayer mounted on an Allis-Chalmers model G tractor. Three nozzles (D3-45) were used per row; 1 overhead and 1 drop on each side. The delivery rate was 50 gpa with a boom pressure of about 50 psi and a speed of 3 mph. Sprays were applied 17, 22, and 28 Nov, and 1 and 5 Dec. Twenty plants per plot were rated for damage on 12 Dec as follows: 0 = no apparent feeding damage; 1 = etching or feeding holes in outer leaves, no whorl damage; 2 = light whorl damage (some whorl leaves without damage); 3 = heavy whorl damage (all whorl leaves damaged). Damage ratings were taken when the plants were 12 to 18 inches tall; the stage considered most susceptible to bud destruction by fall armyworm. Only the percentage of plants showing ratings of 2 and 3 were included in the table since a rating of 1 was not considered a threat to the plant.