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The effectiveness of various soil insecticides was evaluated for the control of insects feeding on tobacco foliage at Southern Piedmont Agricultural Experiment Station, Blackstone, Va. Eleven treatments and an untreated check were arranged in a randomized complete block design replicated 4 times. Flue-cured tobacco was transplanted 1 in plots of 40 × 12 ft (3 rows) on 19 May. The soil was a Chesterfield-Mayodan-Bourne sandy loam (pH 5.8, 3% organic matter). Pretransplant soil treatments were applied, incorporated by double disking, and bedded up on 7 May (ambient temperature, 90-95°F; soil temperature 82-88°F). Granular formulations were broadcast with a Gandy granular applicator mounted on a push cart. The liquid formulations were applied with a COa-pressurized backpack sprayer that delivered 26 gal/acre through Spraying Systems 8002LP tips at 25 psi. Temik treatments were applied over the bedded row in a 12-inch band with a Gandy applicator and incorporated with a rotary tiller on 15 May. The season was dry (0.34, 1.10, 1.95, and 1.72 inches for May, June, July, and August, respectively), but the crop was irrigated 5 times (1.3 inches, 24 Jun and 15 Jul; 1.5 inches, 23 and 28 Jul; and 1 inch, 7 Aug) to maintain proper growth. Moderate populations of the tobacco cyst nematode, Globodera tabacum solanacearum were present in all test plots. Every 1-2 wk from transplanting to the completion of harvest, the most abundant insect pests were sampled in the center row of each plot. Counts included tobacco flea beetles on 10 plants/plot; flea beetle feeding holes on the most damaged leaf of 10 plants/plot on the first 2 observation dates and on the top leaf at least 6 inches long on the 3rd and 4th dates; green peach aphids between the 4th and 6th lateral veins on the right side of 4 upper leaves at least 6 inches long on 10 plants/plot; and tobacco and tomato hornworms together on all plants on the center row of each plot. Tobacco was harvested from each plot, cured, weighed, and graded to determine return in $/acre. Aphid counts were transformed to log10(X + 1) before analysis, but actual means are shown. Data were analyzed by ANOVA, and significant means were separated by DMRT.

Soil Insecticides for Control of Insects Feeding on Flue-Cured Tohacco Foliage, 1987