Control of Thrips in Cotton with In-Furrow Insecticides, 1991

Abstract

Abstract Plots of ‘DPL 50’ were planted on 4 Jun at the University of Arkansas Northeast Research and Extension Center. Granular compounds were applied by Gandy box on the planter. In-furrow liquids were applied with a CO2 powered system mounted on the planter directing sprays into the furrow. The sprayer was calibrated to deliver 6.7 gal/acre at 15 psi through 8003 flat fan nozzles. The Bidrin treatment was applied on 18 Jun using a John Deere high clearance sprayer calibrated to deliver the chemical on the ground near the row and cultivating it in immediately after application. Granular treatments were applied with a coffee can with a small hole in the bottom calibrated to deliver the desired rate. Liquid treatments were applied with a CO2 powered backpack sprayer calibrated to deliver 5 gal/acre at 15 psi through 8002 flat fan nozzles. Plots were 4, 38-inch rows, 50 ft long arranged in a RCB design with 4 replications. Damage ratings were made based on scale of 1-10 with 10 = severe damage. Thrips were counted by removing 5 plants from each plot and washing the plants through a series of sieves, counting the thrips trapped by the last sieve. Yields were taken by harvesting the center 2 rows of each plot.