Aphid Control with Soil Applied Systemic Insecticides, Grand Rapids, 1979

Systemic insecticides were applied as in-furrow split-band treatments to 'Russet Burbank' potatoes planted May 16-17 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 made as split bands along the sides of the hill on Jul 11. Plots were 12-rows wide, 700-ft long, with a 40-Inch row spacing, arranged in a randomized complete block design with 5 replications. Beginning Jul 12 all plots were sprayed with carbaryl at 10-14 day intervals to reduce the numbers of aphid natural enemies. Aphid apterae were counted from 35 mid-plant leaves taken from the center 2 rows of each plot. Plots were harvested Sep 24-26 .