Toxicities of Selected Insecticides Against Tarnished Plant Bug Adults Caged on Seedling Cotton, 1997

The toxicities of selected insecticides were evaluated against TPB at the Macon Ridge Location of the Northeast Research Station. Cotton seed was planted 5 May in a Gigger Gilbert silt loam in plots four rows (40-inch centers) X 50 ft. Treatments were arranged in a RCB with 4 replications. Insecti-cides were applied on 5 Jun using a John Deere 5400N equipped with a 4-row boom calibrated to deliver 10gpaat40psi with 8001 flat-fan nozzles (1/row). TPB adults were collected on 5 Jun from flowering Coreopsis spp. with a 15-inch diameter sweep net, held in the laboratory in a 1.5-ft3 wire mesh cage, and fed green bean, Phaseolus vulgaris. After 24 h, TPB were placed in 20-ml glass vials (5/vial), transported to the field, and caged in 3 X 4-inch mesh bags over a terminal. Plant terminals from 5 plants randomly chosen from the 2 center rows of each plot were infested. The bags were removed and TPB mortality was determined at 24 h after infestation. Mortality was analyzed with ANOVA, and means separated with DMRT. No rainfall was recorded dur-ing this test.