Abstract This test was conducted at the University of Nebraska Field Laboratory, Mead, NE in a fourth-year stand of ‘Vernal’ alfalfa. Plots were 9 X 15 ft, arranged in a randomized complete block design replicated 4 times. A single application of 10 insecticides, at various rates, was made on 26 May ’84. Insecticides were applied with a CO2, activated pressure sprayer calibrated to deliver 12.5 gal/acre at 20 psi and equipped with a 5.5-ft boom. Each plot was sampled twice, 6 and 12 days posttreatment, by taking 5 sweeps per plot with a 15-inch diam insect net.