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Four insecticides and 1 species of entomogenous nematode were applied to a fairway at Fresh Meadow Country Club, Great Neck, Long Island, N.Y., on 12 Aug for control of Oriental beetle grubs. The fairway consisted of Kentucky bluegrass (40%), annual bluegrass (40%), bentgrass (15%), and braoadleaf weeds (&amp;lt;5%). The experimental design was a randomized complete block with 4 replications. Individual plots were 10 × 10 ft. Granular materials were applied with a precalibrated Candy 2.5 spreader. Liquid materials were measured in the laboratory and applied in 2 directions within each plot with 11.4 liters (3 gal) of water through a watering can. At treatment time (12 Aug) the following environmental conditions existed: air temperature, 84°F; soil temperature, 66°F (1 inch), 64°F (3 inches); soil pH 6.2; water pH 6.65; soil moisture, 20.3%; soil texture, 6.9% coarse sand, 48.8% medium sand, 30.2% fine sand, 9.0% very fine sand, and 4.9% silt and clay; thatch, dense, &amp;gt;0.5 inches. Following treatment, the plots received 0.5 inches of irrigation by sprinkler system. The nematodes, Heterorhahditis sp. (strain HP 88), were applied on 20 Aug at a rate of 5 billion/ acre in 5 liters of water through a sprinkling can to the center 4 sq ft of each plot. The nematode application site was immediately watered in by hand with additional water for a total of 11.4 liters. At this time air temperature was 82°F and soil temperature (1 inch) was 79°F. Posttreatment counts were taken on 21 Sep by cutting a 1- × 3-ft strip lengthwise through the middle of each plot by hand and examining the sod and underlying soil for grubs. A 3-sq-ft sample of sod was examined in each plot, and the surviving grubs were counted. Grub species identifications were made in the field. At this time oriental beetle grubs were 80% third instars and 20% second instars. Only the high rate of Sevin SL significantly reduced Oriental beetle grubs at this site. No phytotoxicity was seen in any of the plots.

Fall Control of Oriental Beetle Grubs with Experimental and Labeled Insecticides and Entomogenous Nematodes on a Golf Course, 1987