Management of Scarab White Grubs with Formulations of RH-0345, Imidacloprid, and Trichlorfon on a Low Maintenance Turfgrass Area, 1996

The turfgrass area consisted primarily of fine fescue (80%) and weeds (20%) in Lewistown, Pa. Treatment plots were 8 X 6 ft, arranged in a RCB design and replicated 3 times. Liquid formulations were applied with a CO2 compressed air sprayer with 4 8004VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and applied in 726 ml of water/48 ft2 or delivering 4 gal/1000 ft2. At treatment time (28 Aug) the following soil and environmental conditions existed: air temperature, 70°F; soil temperature at 1 inch depth, 76°F; soil temperature at 2 inch, 74°F; RH, 94.0%; amount of thatch, 0.125 inches; soil textural class, silt loam; soil particle size analysis: % sand, 25.2; % silt, 59.7; % clay, 15.1; organic matter, 3.8%; 26.2% soil moisture (oven dry weight); water pH, 7.0; soil pH, 5.8; application time, mid-morning; and skies overcast. Immediately after treatment the experimental area was irrigated with 0.20 inch of water. Post-treatment counts were made on 1 Oct. Three ft2 sod samples were randomly taken from each replicate, and the total number of scarab white grubs/ft2 was recorded.