Late Season Control of Hornworms in Ga Flue-Cured Tobacco, 1994
Abstract Flue-cured tobacco, CV ‘K-326’, was trans-planted on 29 Mar at the Coastal Plain Experiment Station in Tifton, GA. Production practices were used according to Georgia Cooperative Extension Service guidelines. A pre-plant incorporated tank mix of the following was applied: Tillam and Devrinol for weed control, Ridomil for blue mold control, Nemacur for nematode suppression, and Lorsban for wireworm and mole cricket control. Fertilizer (6-6-18) was applied in a split application at a rate of 0.5 ton/acre. Plots 4 rows wide (44 inch row spacing) X 20 ft long were arranged in a RCB design with 4 replications. On 11 Jul, all plants in each plot were cut down to a 12 inch mainstalk, all leaves were removed, and 100 lb/acre of additional nitrogen (16-0-0) was applied. All cut plants were then allowed to regrow with 2-3 main shoots. On 26 Jul, 9 insecticide treatments (plus an untreated control) were applied to the center 2 rows of selected plots using a CO2-powered backpack sprayer equipped with three TX-12 nozzles directed over a single row, delivering 23.2 gpa at 40 psi. The granular materials were hand applied on all available foliage. The number of live hornworms was recorded per 5 plants on row 2 of each plot prior to the application, and 3, 7, and 10 d after treatment (DAT). The percent defoliation was visually estimated 10 DAT. All data were subjected to ANOVA and DMRT (P = 0.05).