Abstract
Abstract The turfgrass area consisted primarily of annual bluegrass (40%), Kentucky bluegrass (40%), and perennial ryegrass (20%). Treatment plots were 9 X 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 time (22 Aug) the following soil and environmental conditions existed: air temperature, 74°F; soil temperature at 1 inch depth, 82°F; soil temperature at 2 inch, 80°F; RH, 54%; amount of thatch, 0.375-0.5 inches; soil textural class, loamy sand to sandy loam; soil particle size analysis: 74.8% sand, 20.5% silt, 4.7% clay; organic matter, 23.8%; soil moisture (oven dry weight), 40.2; water pH, 7; soil pH, 6.2; application time, mid-morning; and clear skies. Immediately after treatment the experimental area was irrigated with 0.3 inch of water. Posttreatment counts were completed on 3 Oct. 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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