Abstract
Abstract Tests were conducted on a golf course fairway in Lewistown, Pa. The fairway consisted primarily of annual bluegrass (20%), Kentucky bluegrass (40%), and perennial ryegrass (40%). Treatment plots were 9 x 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 4 8004VS Teejet nozzles mounted on a 6-ft boom, operating at 28 psi at delivering spray at 5 gal/1,000 ft2. At treatment time (30 Aug) the following soil and environmental conditions existed: air temperature, 76°F; soil temperature at 1 inch depth, 68°F; RH, 55%; amount of thatch, 0.25-1.25 inches; soil type, loam; soil particle size analysis: 32% sand, 43% silt, 25% sand; soil moisture, 31%; organic matter, 3.6%; water pH, 6.0; soil pH, 5.0; 4.6 inches of rainfall was recorded over the posttreatment period. Immediately after treatment the experimental area was irrigated with 0.5 inches of water. Posttreatment counts were made 25 d later (24 Sep). 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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