| Abstract/Contents: | "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 nozzles 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-inchd epth, 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; aplicatioin time, mid-morning; and skies sunny. Immediately after application 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 clss, 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^DGGF; soil temperaturea t 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, 6.2; 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. An average of 2.6 grubs/ft² was recorded on 18 Sep. The scarab white grub population mixture at posttreatment consisted of 28.8% Japanese beetle, 55.9% Asiatic garden beetle, 8.5% Northern masked chafer, and 6.8% May and June beetle. Nine treatments provided significant control. No phytotoxicity was noted." |
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