Abstract/Contents: | "This trial was conducted on a 2.25-inch cut rough area at Hoodkroft Country Club, Derry, NH. Each treatment was replicated three times, in 49-ft2 plots, using a RCB design. On 7 Apr, three rates of E2Y45 1.67SC and one rate of Merit 75WP were applied to the plots. On 17 May, six rates of E2Y45 1.67SC and one rate of Merit 75WP were applied to the plots. The grass was cut 24 h prior to applications, and then every other day, or on an as needed basis. For the 7 Apr applications, none of the treatments were watered in, but there was 0.2 inch of precipitation 3 h after applications; there was no precipitation 24 h prior to applications. For the 17 May applications, all treatments were hand-irrigated to approximately 0.25-inch, and there was no precipitation within 24 h prior to, or after applications. All treatments were applied using a 7-ft boom on a bicycle-type sprayer. The boom was equipped with four 8005 flat-fan pattern spray nozzles, fitted with 50-mesh screens. The materials were delivered with CO2 pressure, at 40 psi. The vol of insecticide and water mix was 2 gal/1000 ft2. The soil type was as follows: texture, loam; sand, 46%; silt, 45%; clay, 9%; organic matter, 7.6%. Weather and soil conditions on 7 Apr were as follows: sky, overcast; wind, light breeze; air temp, 63°F; soil surface temp, 63°F; at 1-inch depth, 61°F; at 2-inch depth, 59°F; pH, 7.1; moisture, 12.0%. Weather and soil conditions on 17 May were as follows: sky, overcast; wind, 5-8mph; air temp, 63°F; soil surface temp, 67°F; at 1-inch depth, 64°F; at 2-inch depth, 60°F; ph, 7.7; moisture, 13.9%. The plots were rated for live third instar EC larvae on 21 Oct. A Ryan sod cutter, equipped with a 12-inch blade, was used to cut along the center of the plots, 2-inches deep, where 2 ft2 of turf per plot was rolled back to reveal the grubs. Data were subjected to ANOVA and means were separated using DMRT (P ≤ 0.05). On 7 Apr, all treatments showed excellent control. E2Y45 1.67 SC did as well as the standard Merit 75 WP, when applied at 0.25 lb or more. On 17 May, E2Y45 1.67 SC applied at the low rate of 0.025 lb gave the least control (80%). E2Y45 1.67 SC rates, from 0.05 lb to 0.25 lb, gave excellent control and equaled Merit 75 WP at 0.3 lb E2Y45 1.67 SC was an excellent preventive insecticide in this trial when applied at 0.05 lb or more." |