Abstract
Abstract Planting-time soil insectides were evaluated for wireworm control in a field near Hancock, IA, which required replanting because of severe wireworm damage. Field cultivating removed the existing stand and prepared the seedbed for replanting. The experimental design was a randomized complete block with 4 replications. Treatments were applied to single, 40-ft long rows with 30-inch row spacing. Granular insecticide formulations were applied with modified Noble metering units that had been laboratory-calibrated to accurately deliver material at a tractor speed of 4 mph. The applicators were mounted on a 4-row John Deere Max-Emerge 7100 integral planter. Each row was constantly monitored to insure that insecticide was being correctly applied at all times. Drag chains were used for incorporation. Seed treatments were assigned to extra, individual seed hoppers. Following corn emergence, stand counts were taken from 1/1000 acre per treatment and the seeds/seedlings were carefully extracted from 2, 1-m sections of row and inspected for wireworm feeding damage on the following 1 to 4 damage scale: (1) seed/seedling undamaged, (2) seed/seedling damaged but plant established, (3) seed/seedling damaged, plant showing some signs of stress, (4) seed/seedling damaged, no plant or questionable establishment. Insecticide efficacy was analyzed using ANOVA and means were separated with REGWQ.
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