Abstract
This experiment was conducted at the VPI and SU Southern Piedmont Agricultural Research and Extension Center, Blackstone, VA, to evaluate various insecticides applied as foliar treatments for tobacco aphid control on flue-cured tobacco. Tobacco was transplanted into experimental plots on 12 May. Fourteen treatments and an untreated control were established in a RCBD with 4 replications. Plots, 4 × 40 ft (1 row × 24 plants), were separated by single untreated guard rows. Foliar treatments were applied with a CO2-pressurized backpack sprayer that delivered 26 gpa at 60 psi through 3 TX-lO nozzles/row on 9 Jul and 16 Aug. Tobacco aphid populations were estimated on the upper 4 leaves of 10 plants per plot before treatment and at 3, 6, 12, and 20 DAT. Except for insect control, flue-cured tobacco production methods followed recommendations by the Virginia Cooperative Extension Service. Tobacco was harvested as it ripened. It was cured, weighed, and graded by a USDA/AMS inspector, and yield and price were calculated. Price was based on 1993 market prices for the assigned grades. Data were analyzed by ANOVA and significantly different means were separated using DMRT. Aphid counts were transformed to Log10 (x + 1) before ANOVA. Actual means are presented in the table.
Tobacco Aphid Control of Burley Tobacco, 1997