Tobacco Aphid Control on Burley Tobacco, 1996

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 ‘NC 129BH’ was transplanted into experimental plots on 31 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. The Temik 15 G treatment was applied in a 14-inch band and covered with 6 to 8 inches of soil at bedding on 23 May. TPW treatments were applied in 325 gpa with a Holland plunger transplanter. A CO2-pressurized backpack sprayer with an 8004E tip and operated at 20 psi was used to apply TPD treatments in 41 fl oz water to plants in 338-cell float trays 3 d before transplanting. Plants were watered to wash the Admire residue off into the media. Foliar treatments were applied with a CO2-pressurized backpack sprayer that delivered 28 gpa at 60 psi through TX-12 nozzles (3 per row) on 17 Jul and 6 Aug. TA counts were made on the upper 4 leaves of 10 plants per plot. Production practices followed recommendations by the Virginia Cooperative Extension Service. Tobacco was harvested and 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 log 10 (x + 1) before analysis. Actual means are presented in the table.