Tobacco Aphid Control of Burley Tobacco, 1997

Abstract

Abstract This experiment was conducted at the Southern Piedmont Agric. Res. and Ext. Cntr, Blackstone, VA, to evaluate various insecticides applied as foliar, soil, transplant drench (TPD), and transplant water (TPW) treatments for control of TA on burley tobacco. Tobacco ‘Tennessee 90’ was transplanted into experimental plots on 22 May. Eleven treatments and an untreated check were established in a RCB design with 4 replications. Plots, 4 X 40 ft (1 row X 24 plants), were separated by single untreated guard rows. Temik 15 G was applied in a 14-inch band and covered with 6 to 8 inches of soil at bedding on 21 May. Transplant water (TPW) treatments were applied at 204 gpa with a bucket and dipper (4 fl oz/plant). A CO2-pressurized backpack sprayer with an 8004 E tip and operated at 20 psi was used to apply Admire drench treatments (TPD) in 17 fl oz of water to plants in 200-cell float trays at 1 d before transplanting. Plants were irrigated immediately after application to wash Admire residue off the plants into the media. Foliar treatments were applied with a CO2-pressurized backpack sprayer that delivered 28 gpa at 60 psi through 3 TX-12 nozzles/row on 31 Jul. Temperature was 85° F. TA counts were made on the upper leaves of 10 plants per plot. We followed production practices recommended by the Virginia Cooperative Extension Service. 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 log 10 (x + 1) before analysis. Actual means are presented in the table.