Abstract
Abstract This test was conducted on the University of Minnesota Southern Experiment Station at Waseca in corn planted 29 May. Four-row plots, 9.1 m (30 ft) long with 1.2 m (4 ft) alleys, and separated by two rows of corn, were arranged in a randomized complete block design. A Hagie highboy sprayer with two flat fan (8003VS) nozzles/row, delivering 53.6 1/ha (35 gal/acre) at 2.5 kg/cm2 (36 psi) was used to treat the ear zone of each row. A weekly spray schedule was initiated near 10% silk. Due to mechanical problems and weather, a 9 day spray interval resulted. Treatments were applied 11, 20 and 29 Aug. Plots were artificially infested with about 25 neonate ECB larvae/ear on 12 Aug. Treatments were evaluated 8 Sep by randomly selecting 25 ears/plot (100/treatment) and recording total ECB larvae, larval size, location, and feeding damage.
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