Control of Rice Water Weevil with Exp 60949A and Exp 80572B in a Dry-Seeded, Delayed Flood Culture, 1997

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 X 8 ft and surrounded by a metal barrier to prevent movement of insecticides. On 6 May, plots were fertilized with urea at 113 lb nitrogen/acre and planted by hand with treated or untreated seed at 100 lb seed/acre. Seed treated (at the rate shown in the table) with EXP 80572B 44.1 FC was provided by Rhone-Poulenc Ag Company. Selected plots were treated with EXP 60949A 1.5 G at the rates shown in the table. Fertilizer, seed, and insecticide were incorporated into dry League soil with a rake. Immediately after incorporation, plots were flushed (temporary flood for 24^18 h then drain). Rice emerged 15 May. From emergence of rice through soil to application of the permanent flood on 5 Jun (21 d after rice emergence through soil), rice was flush irrigated as needed. On 28 May, plots were sprayed with Facet 75DF at 0.5 lb/acre, crop oil concentrate at 2 pt/acre, Prowl 3.3 EC at 2 pt/acre, and Basagran at 1.5 pt/acre. Herbicides were applied by hand with a 20 ft spray boom pressurized with CO2. Immediately before the permanent flood, selected plots were treated with EXP 60949A 1.5 G at the rates shown in the table. On 19 Jun and 10 Jul, plots were fertilized with urea at 30 lb/acre; thus, total nitrogen applied during the growing season was 173 lb/acre. On 19 Jun (14 d after application of the permanent flood), selected plots were treated with Furadan 3G at 20 lb/acre. All granular insecticides were applied with a hand-held shaker jar. On each of 28 Jun and 14 Jul (23 and 39 d, respectively, after application of the permanent flood), five 4-inch diam X 4 inch deep soil cores (each containing at least 1 rice plant) were removed from each plot. Rice plants in cores were washed and immature RWW recovered from the roots. At maturity, plots were harvested (7 Sep = 117 d from emergence of rice through soil) 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.