Aphid Control with Soil Applied Systemic Insecticides, Grand Rapids, Mn, 1980

Systemic insecticides were applied as in-furrow split-band treatments to ‘Russet Burbank’ potatoes planted May 9-13 at the North Central Experiment Station, Grand Rapids, MN. Soil type was a loamy sand with low organic matter. A sidedress application of Temik, 1 lb ai/acre, was applied Jul 3 as split bands along the sides of the hill. Plots were 12 rows wide, 625-ft long, with a 40-in row spacing, arranged in a randomized complete block with 4 replications. Beginning Jul 8 all plots were sprayed with azinphosmethyl, 0.5 lb ai/acre, at 2-wk intervals to reduce the number of aphid natural enemies. Aphid apterae were counted from 35 mid-plant leaves/plot on Jul 17, 16, Aug 10, and 20. Plots were harvested Sep 24-29.