Summer Control of Japanese Beetle Grubs on a Golf Course Fairway in Lewistown, Pa., 1987

Abstract

Abstract The fairway consisted primarily of annual bluegrass (40%), Kentucky bluegrass (30%), and perennial ryegrass (30%). Treatment plots were 9 × 6 ft, arranged in a randomized comleplete block design and replicated 3 times. Liquid formulations were applied by using a C02 sprayer with 4 8004VS Teejet nozzles mounted on a 6-ft boom, operating at 28 psi delivering 5 gal/1,000 sq ft. 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 (25 Aug), the following soil and environmental conditions existed: air temperature, 76°F; soil temperature, 79°F; RH 47%; amount of thatch, 0.25-0.75 inches; soil type, loam; soil size separation, 40.2% sand, 43.6% silt, 16.2% clay; soil moisture, 23.3%; soil pH 5.4; organic matter, 3.0%; water pH, slightly acidic; 4.85 inches of rainfall was recorded over the posttreatment period. Immediately after i eatment the experimental area was irrigated with 0.25 inches of water. Posttreatment counts were made 25 days later (19 Sep). Three sq ft sod samples were randomly taken from each replicate, and the total number of Japanese beetle grubs/sq ft was recorded.