Abstract
Abstract Experiments were conducted at the Southern Piedmont Agricultural Experiment Station, Blackstone, Va. Plots consisted of single 40-ft rows of tobacco on 4-ft centers separated by untreated border rows. Plots were arranged in a randomized complete block design replicated 4 times. Flue-cured tobacco was transplated on 12 May. Insecticides were applied on 1 Jul with a C02-pressurized backpack sprayer that delivered 24 gal through 3 TX-10 tips at 60 psi. Triton AG-98 was applied at 8 oz/100 gal to all insecticide spray mixtures except Ivory Liquid, Safer Soap, and one Orthene treatment. Aphids were counted between the 4th and 6th veins on the underside of 4 upper leaves of 10 plants/plot. Tobacco was harvested as it ripened. It was then cured, weighed, and graded for determination of its returns. There was 1.95 inches of precipitation during the 1st 3 days after transplanting. Data were analyzed by analysis of variance and significant means were separated using DMRT. Aphid counts were transformed to Log10 (X + 1) before analysis of variance, but data are presented in the table as untransformed means.
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