Tobacco Aphid and Tobacco Flea Beetle Control with Soil Insecticides, 1992:

Abstract

This experiment was conducted at the Ronny and Sammy Thomas Farm, Lawrenceville, VA, to evaluate tobacco aphid and tobacco flea beetle control on flue-cured tobacco with various systemic insecticides applied to the soil. Tobacco was transplanted into experimental plots on 29 Apr. Plots, 15.33 (4 rows) x 140 ft, were arranged in a RCB design with 8 treatments replicated 3 times. Pretransplant soil treatments of liquid insecticide form were applied with a CO2-pressurized tractor sprayer that delivered 36 gal/acre through 8004LP tips at 30 psi on 20 Apr. Soil treatments were immediately incorporated by double disking. After the other treatments had been incorporated, the Temik treatments were applied in 14-inch bands using a tractor-mounted Gandy granular applicator and were immediately covered with 6 inches of soil at bed formation. Orthene was applied in the transplant water (TPW) at 200 gal/acre. Nemacur 3EC at 1 gal/acre was applied to the entire test. Tobacco aphid populations were estimated on the upper 4 leaves of 10 plants in each plot 3 times from 6-8 wk after transplanting. Tobacco flea beetles and flea beetle feeding holes on the most damaged leaf were counted on 10 plants on the 2 center rows of each plot. Tobacco was harvested as it ripened, weighed, and graded by a USDA/AMS inspector. This information was used to calculate tobacco yield and quality. Data were analyzed by ANOVA and significantly different means were separted by DMRT (P = 0.05). Aphid count data were transformed to Log10 (x + 1) before ANOVA.