Control of Rice Water Weevil with Naturalis-L, 1994

Abstract

Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was designed as a RCB with 7 treatments and 4 replications. Each plot was 15 ft × 12 rows (7 inches between rows) and was surrounded by a metal barrier to prevent movement of treatment insecticides. Soil type was League. Rice was drill planted on 26 Mar at 100 lb seed/acre. Rice emerged 11 Apr. From planting to application of the permanent flood, rice was flush irrigated as needed. Urea was applied near planting (29 Mar) at 122 lb/acre, 1 d before the permanent flood (6 May) at 122 lb/acre, and at panicle differentiation (9 Jun) at 122 lb/acre for a total of 170 lb nitrogen/acre. Facet and Basagran were mixed with crop oil and applied 22 Apr at 0.75 lb (AI)/acre for each herbicide. The permanent flood was applied 7 May (26 d after rice emergence). Naturalis-L treatments were applied at the rate and times shown in the table with a 4 nozzle (tip size 800067, 50 mesh screens), hand-held, CO2 pressurized spray rig. Final spray volume was 21.3 gal/acre. Furadan 3G was applied at the time and rate shown in the table with a hand-held shaker. From 31 May to 1 Jun (24-25 d after application of the permanent flood), 5, 4-inch diam × 4-inch deep soil cores (each core contained at least 1 rice plant) were removed from each plot. Rice roots were washed and immature RWW recovered. Plots were harvested at maturity (29 Jul) and yields adjusted to 12% moisture. Insect counts were transformed using vX + 0.5. All data were analyzed by ANOVA.