Abstract
Abstract 'Russet Burbank' potatoes were planted May 18 at the University of Minnesota Rosemount Agricultural Experiment Station. Plots were 6 rows, by 60 feet long, and randomized in complete blocks with 3 replications. The soil was a Waukegan silt loam with medium organic matter. Bravo fungicidal sprays were applied weekly from June 17. Systemic insecticides were applied as in-furrow, split-band treatments at planting. Foliar insecticidal sprays were made on July 13, July 27, August 10, August 24, and September 7, in 100 gallon water/acre at 320 psi. Using a tractor drawn boom sprayer with 3 drop nozzles per row; 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 randomly selected, mid-plant leaves from the center 2 rows of each plot. Counts were made 1 day before spraying and 1 day after spraying except for the 1st spray when only post-spray counts were made.
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