Abstract
Abstract ‘Russet Burbank’ potatoes were planted May 19 at the University of Minnesota Rosemount Agricultural Experiment Station. Plots were 6 rows, 60 ft long, randomized in complete blocks with 3 replications. Foliar insecticidal sprays were applied June 28, July 12, July 26, August 9, August 23, and September 7, in 100 gal water/acre at 250 psi. A tractor-drawn boom sprayer with 3 drop nozzles per row was used; only the 4 center rows of each plot were sprayed. Potato leafhopper nymphs and green peach aphid and potato aphid apterae were counted from 35 midplant leaves from the center 2 rows of each plot. Counts were made on the day following the first application of spray treatments and thereafter on the day preceedingand the day following treatment.
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