Efficacy of Insecticides on Tarnished Plant Bug in Cotton, 1993

Abstract

Abstract A series of tests were conducted at the West Tennessee Experiment Station, Jackson TN, to determine efficacy of 10 insecticides recommended for control of (TPB). Treatments were replicated 3 times in a RCBD. Plots were 2 rows (38-inch spacing) × 20 ft. Each new test was applied to a previously untreated plot of cotton. Organdy sleeve cages were placed on 2 plants per plot and pulled down to the base of the plant. Treatments were then applied with a 2-row CO2 backpack sprayer calibrated to deliver 6 gpa at 40 psi. The sleeve cages were pulled up over the plants and 5 field-collected TPB adults were aspirated into each cage. The cages were labeled and tied. After 48 hr, plants were inspected and number alive and dead recorded. Forty-eight hours after spraying, a third organdy sleeve cage was placed on 1 plant per plot for a test of residual activity of the previously applied insecticides. Five field-collected TPB adults were aspirated into the cage; it was tied and labeled. Number alive and dead were recorded after 24 hr of TPB exposure to the plants. Insecticides which demonstrated good control in the first series of tests were tested again to determine if they could be used as effectively at below recommended rates. These tests were performed as described previously with the exception of no residual testing. The data collected for all tests were analyzed by performing an arcsin transformation of the number of TPB dead in a sleeve cage divided by the total TPB recovered from that sleeve cage. The mean arcsin for each treatment was then analyzed using Duncan’s Multiple Range Test.