EVALUATION OF SELECTED INSECTICIDES FOR CONTROL OF CORN EARWORM IN SWEET CORN, 2003

Abstract

Two tests were planted (28 Apr and 2 Jun) at the University of Georgia's Plant Sciences Farm, near Watkinsville, GA. The tests were set up in a RCB design with four replications. The plots were 2-row by 20 ft with 5 ft alleys between each block. The rows were planted on beds spaced 30 inches apart using a Max Emerge II John Deere planter. Treatment applications were initiated when silks began to appear. Treatments were applied with a backpack CO2 sprayer set at 30 psi delivering 25 gpa. The spray was directed on to the silks of all ears in the plot. The spray dates for the first planting were 27 and 30 Jun, 2,7,9, 11,14, and 16 Jul. The spray dates for the second planting were 18, 21, 23, 25, 28, and 30 Jul, 1 and 4 Aug. All ears in the middle 18 ft of each plot were collected and examined for feeding damage and larvae presence. The harvest dates were 18 Jul (first planting) and 6 Aug (second planting). All means derived from damaged ears and live larvae counts were analyzed using Tukey's Studentized range, with P ≤ 0.05.