Insect Control on Flue-Cured Tobacco with Insecticides Applied to the Soil and in the Transplant Water, 1985

Abstract

Abstract Flue-cured tobacco ‘Coker 319’ was transplanted in 20 ft (12 plants) × 8 ft (2 rows) plots on 2 May. Treatment plots were arranged in a randomized complete block design replicated 4 times. The test site had a Chesterfield-Mayodan-Bourne sandy loam soil with a 5.8 pH and ca. 2% organic matter. Transplant water treatments were applied in 200 gal of solution/acre (116 ml/plant) using a hand-operated transplanter. Temik 15G was applied in a 12 inch band using a Gandy granular applicator mounted on a Honda FourTrax. The granular applicator was also used to broadcast the Furadan treatment. The broadcast and band treatments of Standak were applied with a CO2-powered backpack sprayer operated at 30 psi and incorporated by double disking on 30 Apr. A single 8004E tip was used to apply the band treatment, while the broadcast treatments were applied with a series of 3 8004 tips spaced at 20 inch on a 40 inch boom. Ten and 30 gal of finished spray/acre were used for the band and broadcast applications, respectively. The wind speed on the application date ranged from 2-8 mph and the temperature ranged from 75-82 degrees F. Insect counts were made once every 1-2 weeks from mid-May to mid-August. On the first 3 dates flea beetle feeding holes were counted on 10 plants/plot. Throughout the study, flea beetles and green peach aphids on 4 upper leaves were counted on 10 plants/plot. Tobacco in 1 row was harvested, cured and graded by a USDA Marketing Service grader to determine yield and market price. Aphid data was transformed to Log1() (counts + 1) and hornworm, flea beetle and flea beetle damage data were transformed to the square root (counts + 0.5) before analysis. Data was analyzed using ANOVA and means were compared using DMRT. Actual means of untransformed data are presented in the tables.