Fall Control of Japanese Beetle Grubs with Turcam 76W and Vector Grub on a Golf Course Fairway in State College, Pa, 1994

The fairway consisted primarily of annual bluegrass (50%), Kentucky bluegrass (25%), and perennial ryegrass (25%). Treatment plots were 9 × 6 ft, arranged in a RCB design, replicated 4 times. Two ft untreated barriers were placed between each treatment replicate. Liquid formulations were applied with a hand held sprinkling can in 2.2 gal water. At treatment time one (26 Aug) the following soil and environmental conditions existed: air temperature, 76°F; soil temperature at 1 inch depth, 74°F; soil temperature at 2 inch, 72°F; RH, 72%; amount of thatch, 0.25-0.5 inches; soil type, clay-loam; soil particle size analysis: 22.1% sand, 47.5% silt, 30.3% clay; organic matter, 6.7%; soil moisture (oven baked), 23.5%; water pH, 6-7; soil pH, 6.0; and partly-cloudy skies. Immediately after treatment one the experimental area was irrigated with 0.35 inches of water. At treatment time two (16 Sep) the following soil and environmental conditions existed: air temperature, 78°F; soil temperature at 1 inch depth, 74°F; soil temperature at 2 inch, 72°F; RH, 75%; amount of thatch, 0.25-0.5 inches; soil type, clay-loam; soil particle size analysis: 22.1% sand, 47.5% silt, 30.3% clay; organic matter, 6.7%; soil moisture (oven baked), 33.6%; water pH, 6-7; soil pH, 6.0; and partly-cloudy skies. Immediately after treatment two the experimental area was irrigated with 0.25 inches of water. Posttreatment counts were made 42 DAT (7 Oct). Three ft2 sod samples were randomly taken from each replicate, and the total number of Japanese beetle grubs/ft2 was recorded.