Abstract/Contents: | "The fairway consisted primarily of annual bluegrass (40%), Kentucky bluegrass (40%), and perennial ryegrass (20%). Treatment plots were 4 x 4 ft, arranged in a randomized complete block and replicated 4 times. Liquid formulations were applied with a CO2 compresses air sprayer with 2 8004VS TeeJet nozzles mounted on a 4 ft boom, operating at 28 psi. 800 ml of mixed solution were applied to each replicate unless otherwise noted in a data table. Treatment application were completed on four dates as follows: 5 Aug (air temp, 80° F; soil temp at 1 inch depth, 74° F, soil temp at 2 inch depth, 72° F; % RH, 65; amount of thatch, 0.125-0.25; soil type, loam; soil particle analysis: 40.0% sand, 47.1% silt, 12.9% clay; organic matter, 5.0%; soil moisture (oven baked), 21.5%; water pH, 7.0; pH, 4.6; and cloudy skies), 10Aug (air temp, 90° F; soil temp at 1 inch depth, 80° F; soil temp at 2 inch depth, 82° F; % RH, 60; amount of thatch, 0.125-0.25; soil type, loam; soil particle analysis: 36.5% sand, 48.6% silt, 14.9% clay; organic matter, 2.6%; soil moisture (oven baked), 11.9%; water pH, 7.0; soil pH, 4.9; and clear skies), 20 Aug (air temp, 66° F; soil temp at 1 inch depth, 66° F; soil temp at 2 inch depth, 66° F; %RH, 100; amount of thatch, 0.125-0.25; soil type, loam; soil particle analysis: 40.0% sand, 48.0% silt, 12.0% clay; organic matter, 4.5%; soil moisture (oven baked), 18.8%; water pH, 7.0; soil pH, 4.7; and cloudy skies), and 24 Aug (air temp, 84° F; soil temp at 1 inch depth, 72° f; soil temp at 2 inch depth, 72° F; % RH 80; amount of thatch, 0.125-0.25; soil type, loam; soil particle analysis: 42.0% sand, 47.6% silt, 10.4% clay; organic matter, 5.0%; soil moisture (oven baked), 16.3%; water pH, 7.0; soil pH, 4.7; and clear skies). Immediately after treatment only Turcam 76W replicates were irrigated with 0.25 inches of water. Posttreatment counts were completed between 22- 24 Sept. Two ft2 sod samples were randomly taken from each replicated, and the total number of Japanese beetle grubs ft2 was recorded. Turcam 76W provided significant white grub reduction with exception to the 5 Aug treatment. Bioneem only provided significant white grub reduction when applied on 24 Aug. No phytotoxicity was noted." |