Abstract
Abstract The turfgrass area consisted primarily of annual bluegrass (30%). Kentucky bluegrass (40%), and perennial ryegrass (30%). Treatment plots were 9 X 6 ft, arranged in a RCB design, 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 (21 Aug) the following soil and environmental conditions existed: air temperature, 73°F; soil temperature at 1 inch depth, 84°F; soil temperature at 2 inch, 80°F; RH, 84%; amount of thatch, 0.25-0.75 inches; soil textural class, sandy loam; soil particle size analysis: 58.2% sand, 31.8% silt, 10.0% clay; organic matter, 4.9%; soil moisture (oven dry weight), 25.8; water pH, 7.0; soil pH, 6.4; treatment time, early morning; and clear skies Immediately after treatment the experimental area was irrigated with 0.25 inches of water. Posttreatment counts were completed on 26 Sep. Three ft2 sod samples were taken from each replicate, and the total number of viable Japanese beetle grubs/ft° was recorded.
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