Abstract: Abstract Tests were conducted on the A. W. Benton Farm, Spring Mills, Centre County. Insecticide sprays were applied May 26 to 20 x 20 ft plots in a randomized complete block design with untreated check in 4 replications. Spray con-centrations were applied in 30 gallons of water per acre at 50 psi with a small plot boom type sprayer. Alfalfa weevil densities were estimated from 5 - 180° sweep samples taken randomly across each plot with a 15 in diameter, heavy duty insect net. The sweep arc was maintained approximately 18 in from the sweepers feet. All sweep samples were taken by the same person. Weevil densities were evaluated 5,7,14 and 21 days post treatment. Alfalfa yield was determined from 2 - 3 x 20 ft samples taken per plot on June 16.