Abstract
Abstract The turfgrass area consisted primarily of annual bluegrass (30%), Kentucky bluegrass (40%), and perennial ryegrass (30%). Treatment plots were 9 × 6 ft, arranged in a RCB design, replicated 3 times. Liquid formulations were applied with a hand held sprinkling can in 2 gal water. 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 (5 Jul) the following soil and environmental conditions existed: air temperature, 75°F; soil temperature at 1 inch depth, 64°F; soil temperature at 2 inch, 61°F; RH, 68%; amount of thatch, 0.25-0.5 inches; soil type, loam; soil particle size analysis: 36.5% sand, 41.4% silt, 22.1% clay; organic matter, 5.2%; soil moisture (oven baked), 20.1; water pH, 6-7; soil pH, 5.0; and heavily overcast skies. Immediately after treatment the experimental area received 0.375 inches natural rainfall. Posttreatment counts were completed on 8 Sep (65 DAT). 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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