EVALUATION OF SELECTED INSECTICIDES FOR CONTROL OF BOLLWORM (BW) AND TOBACCO BUDWORM (TBW) IN GEORGIA ON COTTON, 2004

Abstract

This test was conducted at the Southeastern Research and Education Center, Midville, GA. The test was set up in a RCB design with 4 replications and one untreated check per replication. The plots were 4 rows by 50 ft with an untreated border row on each side. The rows were planted on beds spaced 38 inches apart using a 4-row Max Emerge II John Deere planter. Temik 15G at 3.0 lb product/acre was placed in-furrow at planting for early season thrips control. Treatment applications began on 14 Jul when square damage was approaching a threshold of 5%. Treatments were applied with a CO2 spraying system mounted on a Powell high cycle sprayer. The sprayer traveled at a speed of 3.0 mph. Treatments were applied at a volume rate of 10 gpa, at 50 psi, with 3 nozzles per row using TX-3 hollow cone nozzles. Treatments were applied on 14, 20, 27 Jul, and 4 Aug. Weekly efficacy evaluations were done by randomly selecting 5 plants from the middle two rows of each plot and counting all the fruiting structures (squares and bolls) on the upper third of each plant. Fruiting structures were examined for feeding damage and the presence of larvae. The efficacy surveys were done on 20, 27 Jul, 4, and 11 Aug. On 5 Oct, yield was taken by mechanically harvesting the two middle rows of each plot. Means for percent square damage and yield were analyzed using ANOVA with means separation using LSD (P ≤ 0.05).