Alfalfa Weevil Control, 1980

Experimental insecticides were applied to an established alfalfa field at the Middle Tennessee Experiment Station, Spring Hill, TN on Apr 9. Furadan 4F and Imidan were included as standards. Plots were 18 x 20 ft, replicated 4 times in a randomized complete block design. Insecticides were applied at the rate of 25 gal/acre at 30 psi with a CO2-powered boom sprayer mounted on bicycle wheels. Five pendulum sweeps were taken with a 15-in dia insect net in each plot weekly from treatment to harvest. Pretreatment mean was 1.5 alfalfa weevil larvae per 5 sweeps. Yields were taken on May 8 from a 5-ft swath cut out of the center of each plot. Weather information was taken from the experiment station.