Insect Control on Dark Fire-Cured Tobacco, 1992:

Abstract

Abstract This experiment was conducted at the VPI & SU Southern Piedmont Agricultural Experiment Station, Blackstone, VA, to evaluate tobacco aphid and tobacco flea beetle control on dark fire-cured tobacco with various insecticides applied as foliar, transplant water (TPW), and soil treatments. Tobacco was transplanted into plots, 4 (1 row) x 40 ft, on 22 May. Twelve treatments were established in a RCB design with 4 replications. Plots were separated by single untreated guard rows and blocks were separated by vacant 5 ft alleys. Temik was applied in a 14-inch band using a tractor-mounted Gandy granular applicator and immediately covered with 6 inches of soil at bed formation on 21 May. TPW treatments of Orthene and NTN 33893 were applied to the base of the newly transplanted plants with a measuring cup that delivered 8 fl oz/plant (314 gal/ acre). Foliar applications were applied on 9 Jul using a CO2-pressurized backpack sprayer that delivered 26 gal/acre at 60 psi through 3, TX-IO nozzles/row. Tobacco aphid populations were estimated on the upper 4 leaves of 10 plants/plot every 1 to 2 wk from 25 Jun to 10 Aug. Tobacco flea beetles on 10 plants/ plot and flea beetle feeding holes on the most damaged leaf of 10 plants/plot were counted at 2-4 wk after transplanting. Data were analyzed by ANOVA and significantly different means were separated by WD (K = 100). Aphid counts were transformed to Logio (x + 1) before analysis.