INSECTICIDE TOXICITY TO TARNISHED PLANT BUGS (TPB) CAGED ON TREATED. COTTON FOLIAGE, 1999: Cottonseed was planted on 3 May in a ...
(F89) COTTON: Gossypium hirsutum L., 'Stoneville 474' Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) T. S. Hall LSU Agricultural Center Department of Entomology Baton Rouge, LA 70803 Phone: (225) 388-1839 K. D. Torrey & B. R. Leonard LSU Agricultural Center Northeast Research Station, Macon Ridge Location Winnsboro, LA 71295 INSECTICIDE TOXICITY TO TARNISHED PLANT BUGS (TPB) CAGED ON TREATED COTTON FOLIAGE, 1999: Cottonseed was planted on 3 May in a Gigger-Gilbert silt loam soil on 3 May at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Treatments were arranged in a RCB design with 4 replications. Plots consisted of 4 rows (40-inch centers) by 45 ft. Insecticides were applied on 8 Jun using a tractor-mounted 4 row boom, and compressed air system calibrated to deliver 10 gpa at 28 psi with 80015 flat-fan nozzles (2/row). TPB adults were collected from flowering Coreopsis spp. plants with a 15-inch diameter sweep net, held in a 1.5 ft3 wire-mesh cage, and fed green beans, Phaseolus vulgaris. At 24 h after collection, healthy TPB were placed in 20-ml glass vials (3/vial), transported to the field, and caged in 3 x 4-inch mesh cages over cotton plant terminals. Five plants on the 2 center rows of each plot were infested with TPB (3 adults/plant) on 8, 9, and 10 Jun. TPB mortality determined at 24 h after each infestation. No rainfall occurred during this test. Data were subjected to ANOVA and means were separated according to DMRT. All treatments, with the exception of Provado, resulted in significantly higher mortality of TPB compared to that in the untreated plots at 24 HAT. At 48 and 72 HAT, only Orthene and Actara, produced significantly higher mortality than that observed in the untreated plots. No visual phytotoxicity from any insecticide treatment was observed in this test.
