Prebloom Control of Insect Pests of Alfalfa, 1987

This test was undertaken in a commercial stand of ‘Vernima’ seed alfalfa that has been in production for 3 yr near Gardena, Walla Walla County, Wash. Spray treatments were applied with a C02-powered backpack sprayer calibrated to deliver 27 gal/acre at 30 psi from a 4-ft boom with 4 8003 flat-fan nozzles on 19-inch spacings. Treatment date was 16 Apr and subsequent samples were collected on 23 Apr and 6 May. Each sample was made up of 5 180-degree sweeps from a 15-inch-diam sweep net.