Evaluation of Merit to Control Green June Beetle Grubs on a Golf Course Fairway in Wayne, Penn-Sylvania, 1995
Abstract The fairway consisted primarily of annual bluegrass (50%) and creeping bentgrass (50%). Treatment plots were 9 X 6 ft, arranged in a randomized complete block design and replicated 3 times. Liquid formulations were applied by using a CO2 compressed air sprayer with 4 8004VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and applied in 1021 ml of water/54 ft2 or delivering 5 gal/1000 ft2. Granular treatments were applied with a fine grade top-dressing sand to facilitate product distribution. At treatment time (6 Jun), the following soil and environmental conditions existed: air temperature, 77°F; soil temperature at 1 inch depth, 80°F; soil temperature at 2 inch depth, 78°F; RH, 74%; amount of thatch, 0.25-0.5 inches; soil textural class, silt-loam; soil particle size analysis: 32.1% sand, 53.8% silt, 14.2% clay; soil moisture (oven dried), 31.1%; organic matter, 8.3%; water pH, 6.5; soil pH, 5.2; application time, late-morning; and cloudy skies. Immediately after treatment the experimental area was irrigated with 0.3 inch of water. Posttreatment counts were made on 6 Sep. The total number of new freshly constructed green June beetle burrows was recorded from each replicate (54 ft2) as well as the total number of green June beetle larvae flushed to the surface following an application of Sevin 80WSP over a 24 hr observation interval.