Control of Rice Water Weevil with Karate in a Water-Seeded,Continuous Flood Culture,1996

Abstract

Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was designed as a RCB with 8 treatments and 4 replications. Each plot was 15 ft X 8 ft and surrounded by a metal barrier to prevent movement of insecticide. On 12 Apr, plots were fertilized with urea at 113 lb nitrogen/acre and treated with Ordram 15G at 27 lb product/acre. Fertilizer and herbicide were incorporated into dry soil (League clay) with a rake. Plots were flooded to a depth of about 4 inches and hand-planted with sprouted seed at 130 lb dry seed/acre on 12 Apr. Rice emerged 23 Apr. At the times and rates shown in the table, designated plots were treated with Karate 1EC using a 4 nozzle (tip size 800067, 50 mesh screens), hand-held, spray rig pressurized with CO2. Final spray volume was 33.4 gpa. Furadan 3G was applied to designated plots at the rate and time shown in the table using a hand-held shaker jar. On each of 20 May and 17 Jun (27 and 55 d after rice emergence through the water), five 4 inch diam X 4 inch deep soil cores (each core containing at least 1 rice plant) were removed from each plot, washed, and inspected for immature RWW. On 6 Jun, plots were fertilized with urea at 57 lb nitrogen/acre; thus, total nitrogen applied during the growing season was 170 lb/acre. At maturity, plots were harvested (5 Aug) with a small plot combine. Yields were adjusted to 12% moisture. Insect counts were transformed using x + 0.5 and all data analyzed by 2-way ANOVA and DMRT.