Jarrod T. Hardke1, Gus M. Lorenz1, Kyle Colwell1, Craig Shelton1, and Wes Kirkpatrick2. (1) Univ. of Arkansas CES, P.O. Box 391, Little Rock, AR 72203, (2) University of Arkansas, 310 Oak Street, Box 230, McGehee, AR 71654
Field experiments were conducted in 2005 at a single location in Arkansas to evaluate efficacy of selected insecticides to control the cotton aphid (Aphis gossypii). At 3 DAT, Intruder (acetamiprid) at 0.0175 lb ai/a + Dyne-amic (non-ionic spray adjuvant) at 1 pt/a, Intruder (acetamiprid) at 0.025 lb ai/a + Dyne-amic (non-ionic spray adjuvant) at 1 pt/a, Centric (thiamethoxam) at 0.031 lb ai/a, Trimax (imidachloprid) at 0.047 lb ai/a, Trimax (imidachloprid) at 0.031 lb ai/a, and Carbine (flonicamid) at 0.06 lb ai/a + Mustang Max (zeta-cypermethrin) at 0.02 lb ai/a all significantly differed from the untreated check. Of these treatments, Intruder (acetamiprid) at 0.0175 lb ai/a + Dyne-amic (non-ionic spray adjuvant) at 1 pt/a and Intruder (acetamiprid) at 0.025 lb ai/a + Dyne-amic (non-ionic spray adjuvant) at 1 pt/a were numerically the best treatments, but they did not significantly differ from the other treatments which were significantly different from the untreated check. Field experiments were conducted in 2005 at a single location in Arkansas to evaluate efficacy of selected insecticides to control the bandedwinged whitefly (Trialeurodes abutilonea). At 3 DAT, Intruder (acetamiprid) at 0.04375 lb ai/a, Experimental 1, Experimental 2, Orthene (acephate) at 1 lb ai/a, and Centric (thiamthoxam) at 0.05 lb ai/a all significantly differed from the untreated check. Of these treatments, Orthene (acephate) at 1 lb ai/a was numerically the best treatment, but it did not significantly from the other treatments, which were significantly different from the untreated check except for Experimental 1. At 7 DAT, no treatments significantly differed from the untreated check. For seasonal totals of whiteflies, all treatments significantly differed from the untreated check except Capture (bifentrhin) at 0.0782 lb ai/a. Orthene (acephate) at 1 lb ai/a was significantly better than all other treatments except Intruder (acetamiprid) at 0.04375 lb ai/a.
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