Control of Rice Water Weevil with Fipronil, 1995
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 9 treatments and 4 replications. Each plot was 15 ft X 8 ft, surrounded by a metal barrier to prevent movement of insecticide. On 28 Apr, plots were treated with the herbicide Ordram 15G at 4 lb (AI)/acre and fertilized with 19-19-19 at 250 lb/acre (47.5 lb N/acre). Herbicide and fertilizer were applied by hand and lightly incorporated with a rake into League soil. Fipronil-impregnated fertilizer was provided by Rhone-Poulenc Ag Company. EXP60655A 1.65G was applied with a hand-held shaker jar. EXP60720A 80WG was applied with a 4 nozzle (tip size 800067, 50 mesh screen), hand-held, CO2 pressurized spray rig. Final spray volume was 32 gpa. EXP60655A 1.65G and EXP60720A 80WG were lightly incorporated with a rake into the dry soil. Following these operations, plots were flooded on 28 Apr and hand-planted (water-seeded) on the same day with appropriate presprouted treated or untreated seed at 130 lb dry seed/acre. To presprout seed, dry seed was soaked in water for 1 d then drained for 1 d. Seed treatments were applied to presprouted seed according to instructions provided by Rhone-Poulenc Ag Company. On 7 May (9 d after planting) rice emerged through the water (flood depth was about 4 inches). Furadan 3G was applied with a hand-held shaker jar. On 12 Jun, urea was applied to all plots at 50 lb N/acre (97.6 lb N/acre was applied for the entire experiment). From 24 May-1 Jun (17-25 d after rice emergence through the 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. Sampling was repeated 22-26 Jun (46-50 d after emergence through the water). At maturity (16 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.