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Abstract
Abstract A study was conducted to evaluate 11 chemical treatments for the control of the tobacco aphid on tobacco grown in a Chesterfield-Mayodan-Bourne sandy loam soil at the Southern Piedmont Agricultural Experiment Station, Blackstone, Va. Tobacco was transplanted in experimental plots arranged in a randomized complete block design with 4 replications on 9 May. Five plants infested with aphids in each plot were selected and marked with spray paint. Aphid populations on the upper 4 leaves of each marked plant were counted 1 d before application and at 4, 7 and 14 DAT. Treatments were applied on 19 Jul using a CO2-pressurized backpack sprayer that delivered 25 gal/acre through 3 TX-10 hollow-cone nozzles/row at 60 psi. Aphid counts were transformed to Log10(X + 1) before analysis of variance. Actual means are presented in the table.
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