Abstract
Abstract Experimental plots (12 by 12 m) were established in a field of ‘Olds-88’ alfalfa at the University of Wisconsin Arlington Research Station in Columbia County. Each treatment was replicated 4 times and arranged in a randomized complete block design. Treatments were applied 23 Aug from a tractor-mounted sprayer equipped with 8002 Teejet flat-fan nozzles delivering 188 liters finished spray/ha at 35 psi. Insecticide-impregnated dry fertilizer was prepared by placing the fertilizer in a cement mixer and slowly spraying the formulated insecticide into the revolving drum with a hand-held mist sprayer. Approximately 2 min was allowed for blending. The fertilizer-insecticide mixture was in a checkerboard pattern applied with a push-type broadcast spreader. Insect abundance was estimated by taking 20 pendulum sweeps in each plot with a standard 38-cm-diam sweep net.
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