Pea Aphid Control on Peas, 1977

‘Green Giant 531’ peas were planted April 29 at the University of Minnesota Rosemount Agricultural Experiment Station. Plots were 16 x 46 ft, randomized in complete blocks with 3 replications. The insecticides were applied June 21, 28, and July 6, in 60 gal water/acre at 176 psi, using a tractor-drawn boom sprayer. Counts were made 1 day before spraying and 1 day after spraying. The samples were taken with a vacuum machine. Each sample consisted of 10 “put-down” of the 8-inch diameter vacuum hose (3.5 sq ft/plot) after vigorously shaking the pea plants at each sample site.