Tobacco Hornworm and Tobacco Budworm Control on Tobacco with Bacillus Thuringiensis, 1993

This experiment was conducted at the VPI and SU Southern Piedmont Agricultural Research and Extension Center, Blackstone, VA, to evaluate THW and TBW control on flue-cured tobacco with Orthene, Lannate and various formulations and rates of Bacillus thuringiensis. Tobacco was transplanted into experimental plots, 8 × 40 ft (2 rows × 24 plants) on 12 May. Ten treatments were established in a RCBD with 4 replications. Foliar treatments were applied on 9 Jul using a CO2-pressurized backpack sprayer calibrated to deliver 27 gpa at 60 psi through 3 TX-10 nozzles/row. TBW and THW were reared on artificial diet in the laboratory for 7 d and released in the 1st and 2nd rows of each plot, respectively. One larva was released on each of 20 plants/plot on 6 Jul. THW and TBW were counted on 3, 7, and 14 DAT. Data were analyzed by ANOVA and significantly different means were separated by DMRT. TBW and THW data were transformed to square root (x + 1) before ANOVA.