Control of Rice Water Weevil with Karate 1Ec, 1995

Abstract

Abstract The experiments were conducted at the TAMU Agricultural Research and Extension Center at Beaumont. Experiment I was water-seeded rice with continuous flood. The experiment was designed as a RCB with 6 treatments and 4 replications. Each plot was 15 ft X 8 ft and was surrounded by a metal barrier to prevent movement of insecticide. On 12 May plots were treated with Ordram 1 at 27 lb/acre and fertilized with urea at 110.5 lb N/acre followed by a light incorporation into dry, cloddy soil (League) with a rake. Plots were then flooded and sown (12 May) with presprouted Gulfmont seed at 130 lb dry seed/acre. To prepare presprouted seed, dry seed was soaked in water for 24 h then drained and allowed to air dry for 24 h before planting. Flood depth was about 4 inches and rice emerged through water 18 May–6 d after planting. Karate treatments were applied with a 4 nozzle (tip size 800067, 50 mesh screen), hand-held, CO2 pressurized spray rig. Final spray volume was 30 gpa. Furadan was applied with a hand-held shaker jar at the rate and time shown in Table 1. On 12 Jun (25 d after emergence of rice through water) 5, 4 inch diam X 4 inch deep soil cores (each core contained at least 1 rice plant) were removed from each plot, washed, and immature RWW recovered. At maturity (24 Aug) plots were harvested with a small combine and yields adjusted to 12% moisture. Insect counts were transformed using x+0.5 and all data analyzed by 2 way ANOVA and, where appropriate, DMRT.