Abstract
Abstract A single insecticide formulation, applied as infurrow and T-band treatments in conventional and no-till corn, was evaluated for control of black cutworm larvae. The test plot was planted in a continuous corn field on the UK Spindletop Research Farm in Fayette Co., KY, on 11 May as a split-plot design with 4 replicates. Main-plot treatments consisted of either conventional tillage or no-till, while the sub-plot treatments were methods of insecticide application. Individual sub-plots consisted of 2 rows of no-till corn, 11 m long, with 96.5 cm row spacing. All insecticides were applied using a Noble granular applicator at planting. Gramoxone Extra 2.5S and Bicep 6WDL were applied on 11 May for weed control at 2.25 pt/acre and 2.4 qt/acre, respectively. Ten-inch aluminum barriers were buried 4 to 5 inches into the soil around a 2 × 2 m section in the middle of each plot. On 19 May, 24 third instar black cutworms, obtained from the USDA-ARS Corn Insect Research Unit, Ankeny, IA, were released inside each of the barriers. Stand counts and numbers of cut plants were recorded on 21, 23, 26, 30 May, 2, and 6 Jun. A plant was considered cut if at any time it was cut off by cutworms, regrowth was disregarded. Number of killed/missing plants was recorded on 6 Jun. Data were transformed by arcsin-squareroot then subject to ANOVA and treatment means compared to the control by LSD (SAS Institute).
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