Control of a Sharpshooter with Exp 80698A and Karate, 1997

Abstract

Abstract The experiment was conducted in a greenhouse at the TAMU Agricultural Research and Extension Center at Beaumont and was designed as a RCB with 6 treatments and 4 replications. The greenhouse was maintained at 31° C, 70% relative humidity, and 12 h light:12 h dark. Each experimental unit was a pot (6 inch diam X 6 inch deep) filled with sifted League soil. On 30 Sep, selected pots were planted with 8 untreated or EXP 80698A 75 FS-treated seeds. Seeds were treated at the rates shown in the table using the “Le Sak” method developed by Rhone-Poulenc Ag Company. On the same day, selected pots were sprayed with EXP 80698A 75 FS at the rates shown in the table using a 4 nozzle (800067 tip size, 50 mesh screens), hand-held spray rig pressurized with CO2. Final spray volume was 9.0 gpa. On the same day, pots were fertilized with urea at 51 lb nitrogen/acre. Immediately following planting, and spraying, soil in each pot was “raked” with forceps to simulate incorporation. On 5 Oct, rice emerged through soil. On 21 Oct, selected pots were treated with Karate at the rate shown in the table using the same spray rig and final spray volume as before. Immediately after spraying Karate, a plastic cylinder was placed over 2 plants in each pot. Cylinders were 3 inch in diam so that the plant density within a cylinder was equal to a seeding rate of 90 lb/acre, given 100% emergence and survival of seeds. The cylinders were ventilated with screen windows and tops. After securing the cylinders, which served as cages, each was infested on 21 (Oct 17 d after emergence of rice through soil) with 5 adult sharpshooters. Insects were collected from untreated rice using a sweep net. Two d later, cages were inspected for live and dead sharpshooters. Data were expressed as % mortality which was transformed using arcsine. Transformed data were then analyzed by 2-way ANOVA and means separated by DMRT.