Summer Control of Japanese Beetle, 1988

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 by 6 ft, arranged in a randomized complete block design and replicated 3 times. Liquid and 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. Granular formulations were applied with a hand-held shaker and mixed with a fine grade of sand top dressing to facilitate product distribution. At treatment time (30 Aug) the following soil and environmental conditions existed: air temperature, 78°F; soil temperature at 1 inch depth, 70°F; RH, 50%; amount of thatch, 0.25-1.25 inches; soil type, sandy clay loam; soil particle size analysis: 55% sand, 24% silt, 21% sand; soil moisture, 16.8%; organic matter, 2.7%; water pH, 6.0; soil pH, 5.1; 6.5 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 27 DAT (26 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.