Management of Scarab White Grubs with Imidacloprid and Halofenozide in a Low Maintenance Turf-Grass Area, 1997

Abstract

Abstract The turfgrass area in Lewistown, PA, consisted primarily of fine fescue (80%) and weeds (20%). Treatment plots were 8 X 6 ft, arranged in a RCB block design and replicated 3 times. Granular formulations were applied with a hand-held shaker, and top dressing sand was added to facilitate product distribution. Liquid formulations were applied with a CO2 compressed air sprayer with 4 8002VS TeeJet nozzle mounted on a 6-ft boom, operating at 28 psi, and applied in 726 ml of water/48 ft2 or delivering 4 gal/1000 ft2. At the 1st treatment time (19 May) the following soil and environmental conditions existed: air temperature, 72° F; soil temperature at 1 inch depth, 71° F; soil temperature at 2 inch, 68° F; RH, 70%; amount of thatch, 0.0625 inch; soil textural class, silt loam; soil particle size analysis: % sand, 28.8; % silt, 56.4; % clay, 14.8; organic matter, 3.7%; percent water content (percent of weight), 19.9; water pH, 7.0; soil pH, 6.0; application time, late morning; and skies cloudy. Immediately after application each treatment was irrigated with 0.25 inch of water. At the 2nd treatment time (11 Jun) the following soil and environmental conditions existed: air temperature, 75° F; soil temperature at 1-inch depth, 74° F; soil temperature at 2 inch, 69° F; RH, 80.0%; amount of thatch, 0.0625 inch; soil textural class, silt loam; soil particle size analysis: % sand, 22.4; % silt, 62.6; % clay, 15.0; organic matter, 4.3%; percent water content (percent by weight), 20.7; water pH, 7.0; soil pH, 5.9; application time, mid-morning; and skies sunny. Immediately after application each treatment was irrigated with 0.25 inch of water. At the 3rd treatment time (14 Jul) the following soil and environmental conditions existed: air temperature, 98° F; soil temperature at 1-inch depth, 91° F; soil temperature at 2 inch, 87° F; RH, 76%; amount of thatch, 0.0625 inch; soil textural class, silt loam; soil particle size analysis: % sand, 28.9; % silt, 56.2; % clay, 14.9; organic matter, 6.2%; percent water content (percent by weight), 13.5; water pH, 7.0; soil pH, 5.7; application time, mid-morning; and skies sunny. Immediately after application each treatment was irrigated with 0.25 inch of water. At the 4th treatment time (21 Aug) the following soil and environmental conditions existed: air temperature, 71° F; soil temperature at 1-inch depth, 70° F; soil temperature at 2 inch. 68° F; RH, 74%; amount of thatch, 0.0625 inch; soil textural class, silt loam; soil particle size analysis: % sand, 26.3% silt, 60.4; % clay, 13.3; organic matter, 4.2%; percent water content (percent by weight), 20.8; water pH, 7.0; soil pH, 6.1; application time, mid-morning; and skies sunny. Immediately after application, each treatment was irrigated with 0.25 inch of water. Post-treatment counts were made on 18 Sep. Three ft2 sod samples were randomly taken from each replicate, and the total number of scarab white grubs/ft2 was recorded.