Abstract
Abstract Sweet corn was planted 5 Oct in Myakka fine sand on the Univ. of Florida’s Agricultural Research and Education Center in Sanfbrd. Furadan 10G 2 lb (AI)/acre and Lasso 15G 3 lb (AI)/acre were incorporated at planting time in a 15 inch band for nematode and weed control, respectively. A plot consisted of one 50-ft row with 12-inch plant spacing. Plots were separated by 2 untreated rows (row spacing was 30 inches). Treatments were replicated 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 were used per row; 1 overhead (TX 24) and 1 drop (TX 12) on each side. The delivery rate was 50 gap with a boom pressure of about 40 psi and a speed of 3 mph. Sprays were applied 27 Oct, 4, 12, and 15 Nov. Twenty plants per plot were rated for damage on 19 Nov as follows: 0 = no damage; 1 = etching only (evidence of foliar feeding by newly hatched larvae); 2 = light bud damage; 3 = severe bud damage; and 4 = bud completely destroyed. Damage ratings were taken when the plants were 12 to 18 inches tall; the stage considered most susceptahle to bud destruction by fall armyworm. Only the percentage of plants showing ratings of 3 and 4 were included in the table since the lower ratings were not considered a threat to the plant.
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