Control of Rice Water Weevil With Fipronil in A Drill-Seeded, Delayed Flood Culture–Eup Study, 1996

Abstract

Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was a non-replicated experimental use permit (EUP) study with 4 treatments. Plot size was 3 acres. On 26 Mar, plots were fertilized by air with 55-40-0 at 56 lb nitrogen/acre. Fertilizer was in-corporated with a “Do-all” on the same day. On 27 Mar, a designated plot was treated with Fipronil 80 WG at 0.0325 lb (AI)/acre using a large (11 nozzle, tip size80015, 50 mesh screens), 2 person, hand-held spray boom pressurized with CO2. Final spray volume was 10.6 gpa. Following application, the treatment was incorporated with a spike-tooth harrow. On 27 Mar, plots were drill-planted (7.5 inches between rows) with fipronil-treated or untreated seed at 90 lb/acre. Seed was treated with fipronil at 0.0325 lb (AI)/ cwt seed. All seed was provided by Rhone-Poulenc Ag Company which obtained untreated, registered seed from G&H Seed Co., Inc., Crowley, LA. Plots were “rolled” after planting to help cover seed and to create a firm seedbed. Plots were flush irrigated (temporary flood for 24th, then drain) on 5 Apr. Rice emerged 15 Apr. No differences in emergence were detected among the plots. From emergence to application of the permanent flood onl6May(31d after rice emergence), rice was flush irrigated as needed. On 24 Apr, plots were treated by air with Stam 4E and Basagran at 3 qt and 1 pt/acre, respectively. On 9 May, plots were fertilized by air with urea at 55 lb nitrogen/acre. Furdan 3G at 0.5 lb (AI)/acre was applied by air to the designated plot on 30 May (14 d after application of the permanent flood). On each of 5 Jun and 24 Jun (20 and 39 d after application of the permanent flood), twenty 4 inch diam X 4 inch deep soil cores were removed (each core containing at least 1 rice plant) from each plot. Rice plants in cores were washed and immature RWW recovered from the roots. On 3 Jun, plots were fertilized with urea at 60 lb nitrogen/acre; thus, total nitrogen applied to the plots for the growing season was 171 lb/acre. All aerial applications were made by M&M Air Service of Beaumont, TX. Plots were not harvested due to mechanical and weather problems. Insect counts were transformed using x + 0.5 and analyzed by 1 -way ANOVA and LSD.