Control of Tobacco Aphids with Confidor and Orthene, 1992:

Abstract

Abstract Flue-cured tobacco was transplanted at the Central Crops Research Station, Clayton, NC, on 30 Apr with a 2-row transplanter. The soil type was Norfolk loamy sand and soil moisture was good. Individual plots were 2 rows (1.14 m apart) wide by 22 plants (ca. 13.7 m) long and were arranged in a randomized-complete block design with 5 treatments and 4 blocks. On 1 May, the Confidor drench treatment was applied. Using a wooden stake, a hole was dug adjacent to each plant in the plot. Four oz of the insecticide suspension was applied in each hold to deliver 0.01 gr [AI] per plant. Once a wk after transplant, all plants in 1 row (20 plants) of the Confidor drench treatment and the control were rated for aphid abundance (0-7 scale). On 23 Jun, the entire test was rated for aphid abundance and the foliar treatments were applied. Foliar treatments (Confidor 240 FS at 50 gr [AL]/ha, Confidor 240 FS at 50 gr [AI]/ha tank mixed with Silwet L-77 at 8 oz per 100 gal, & Orthene TIS at 840 gr [AI]/ha) were applied using a 2-row, CO2-powered sprayer. Materials were applied through a single D2-33 Spraying Systems full-cone nozzle per row at 414 kpa (60 psi) and a delivery rate of 234 li/ha (25 gal/acre). At 3, 10 and 17 d after treatment, aphid abundance in all plots was rated (0-7). Using these aphid abundance data, the avg aphid ratings were calculated. Aphid ratings were subjected to ANOVA and WD, K = 100, was used to separate treatment means.