Fall Control of Japanese Beetle Grubs With Dursban Pro, Talstar F, and Experimental Formulations on a Golf Course Fairway in Lewistown, Pennsylvania, 1995

The fairway consisted primarily of annual bluegrass (40%), Kentucky bluegrass (40%), and perennial ryegrass (20%). Treatment plots were 9 X 6 ft, arranged in a randomized complete block design, replicated 3 times. Liquid formulations were applied with a CO2 compressed air sprayer with 4 8004VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and applied in 1021 ml of water/54 ft2 or delivering 5 gal/1000 ft2. At treatment time (29 Aug) the following soil and environmental conditions existed: air temperature, 80°F; soil temperature at 1 inch depth, 80°F; soil temperature at 2 inch, 79°F; RH, 75.0%; amount of thatch, 0.25-0.50 inches; soil textural class, loam; soil particle size analysis: % sand, 44.4; % silt, 34.6; % clay, 21.0; organic matter, 4.6%; soil moisture (oven dry weight), 20.9; water pH, 7.0; soil pH, 4.7; application time, mid-morning; and skies partly cloudy. Immediately after treatment the experimental area was irrigated with 0.25 inches of water. Posttreatment counts were made 41d later (9 Oct). Three ft2 sod samples were randomly taken from each replicate, and the total number of Japanese beetle grubs ft2 was recorded.