Aphid Control on the Flue-Cured Tobacco with Foliar Insecticides, 1997

Abstract

Abstract This experiment was conducted at the Southern Piedmont Agric. Res. and Ext. Cntr., Blackstone, VA to evaluate various foliar insecticides for TA control and to determine the effects of the treatments on the yield of flue-cured tobacco. Tobacco ‘Coker 371Gold’ was transplanted into experimental plots on 19 May. Seven treatments and an un-treated control was established in a RCB design with 4 replications. Plots, 4 X 40 ft (1 row X 24 plants), were separated by a single untreated guard rows. Except for insect control, flue-cured tobacco production methods followed the recommendations of the Virginia Cooperative Extension Service. Treatments were applied as foliar sprays with a CO2-pressurized backpack sprayer that delivered 30 gpa at 50 psi through TX-12 nozzles (3/row) on 4 and 22 Jul. Temperatures ranged from 88-90 °F during both applications. TA counts were made on the upper 4 leaves of 10 plants per plot before treatment and at 3 to 24 DAT. On 21 Aug, TA damage was rated on a scale of 0-10: 0 = no injury; 10 = very severe injury as indicated by necrotic leaf tissue, honey-dew, and sooty mold. Dipel 4 L at 0.5 qt/acre was applied to the entire test for budworm and tobacco hornworm control on 3 Jul. Tobacco was harvested, cured and yield was determined. Data were analyzed by ANOVA and significantly different means were separated by Waller-Duncan K-ratio t-test (K = 100). TA count data were transformed to log10 (x + 1) before analysis. Actual means are presented in the table.