Abstract
Abstract Tests were conducted on the fairway of a golf course in Mifflin County, Pa. The fairway consisted primarily of annual bluegrass (10%), Kentucky bluegrass (40%), and perennial ryegrass (50%). Treatment plots were 9 by 6 ft, arranged in a randomized complete block design and replicated 3 times. Liquid and soluble powder formulations were applied with a CO2 sprayer with four 8004VS Teejet nozzles mounted on a 6-ft boom, operating at 28 psi and at a spray rate of 5 gal/1,000 ft2. At treatment time (17 Sep) the following soil and environmental conditions existed: air temperature, 58°F; soil temperature at 1-inch depth, 57°F; RH 55%; amount of thatch, 0.25-1.25 inches; soil type, loam; soil particle size analysis: 35% sand, 47% silt, 18% sand; soil moisture condition, moist; organic matter, 1.9%; water pH, 6.0; soil pH, 5.0; 1.5 inches of rainfall was recorded over the posttreatment period. All treatments were applied during a very light rain. Posttreatment counts were made 30 d later (17 Oct). Three sod samples of 1-ft2 each were randomly taken from each replicate, and the total number of Japanese beetle grubs/ft2 was recorded.
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