Abstract
Abstract The turfgrass area consisted primarily of annual bluegrass (40%), Kentucky bluegrass (40%), and perennial ryegrass (20%). Treatment plots were 9 × 6 ft, arranged in a RCB design and replicated 3 times. Granular formulations were applied with a hand-held shaker and mixed with a fine grade top-dressing sand to facilitate product distribution. At treatment (18 Aug) the following soil and environmental conditions existed: air temperature, 75°F; soil temperature at 1 inch depth, 74°F; soil temperature at 2 inch, 74°F; RH, 78%; amount of thatch, 0.125-0.5 inches; soil type, sandy-loam; soil particle size analysis: 72.0% sand, 16.0% silt, 12.0% sand; organic matter, 5.0%; soil moisture (oven baked), 51.9; water pH, 7; soil pH, 6.0; and clear skies. Immediately after treatment the experimental area was irrigated with 0.25 inches of water. Posttreatment counts were completed on 23 Sep. Three ft2 sod samples were taken from each replicate, and the total number of viable Japanese beetle grubs ft2 was recorded.
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