Abstract
Abstract Experimental plots measuring 12 m × 15 m were established in a field of 'Olds 88' alfalfa at the University of Wisconsin Arlington Research Station in Columbia County. Treatments were replicated 4 times in a randomized complete block design, and applied on 24 Jul by using a tractor-mounted compressed air sprayer equipped with 8002 Teejet flat fan nozzles delivering 141 liter of finished spray/ha at 35 PSI. Insect abundance was estimated by taking 20 consecutive pendulum sweeps in each plot with a 38 cm diam sweep net.
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