Abstract
Abstract Trials of foliar sprays to Colorado potato beetle were conducted at the Michigan State University Montcalm Potato Research Farm, Entrican, MI. Potatoes were planted on 13 May 1988. Plots were 3 rows wide (34 inch row spacing) by 40 ft long and treatments were arranged in a randomized complete block design with 4 replications/treatment. Adjacent plots were separated by two untreated rows. Treatments were applied on 17 and 23 Jun, and 1 Jul with a tractor-mounted boom sprayer at 30 gal/acre, 40 psi, with a cluster of 3 nozzles over each row. The middle nozzle directed spray down over the top of the plant, and the other nozzles directed the spray at the sides of the plant. Insects were counted from randomly-selected plants (1/plot prior to treatment, 2/plot for post-spray samples) on 14 Jun (pretreatment count), 21 and 23 Jun, and 7 Jul. Damage ratings both on a per plot and a per plant (2 plants/plot) basis were made on 7 Jul. The center row of each plot was harvested and potatoes sorted by size and weighed on 5 Oct.
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