Abstract

Abstract The study was conducted at the University of Minnesota Agricultural Experiment Station, Rosemount, MN, on 1st regrowth 2nd year alfalfa. Treatments were 26 × 26 ft and replicated 3 times in a randomized complete block design. Spray treatments were applied on 29 May with a tractor-drawn boom sprayer in 36 gal water/acre at 200 psi. Plant height at spray application was 23-26 inches. Insects were sampled 1, 4, 7, 14, and 21 days posttreatment by taking 10 sweeps per plot with a 15-inch diam sweep net. One day posttreatment, 1.5 inch of rain fell and there was marble-sized hail resulting in broken alfalfa stems and lodging; an additional 0.5 inch of rain 3 days posttreatment.

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