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COMPARISON OF DPX E2Y45 TO MERIT AND ARENA AS A MID-SUMMER CURATIVE TEST AGAINST EUROPEAN CHAFER, 2006

COMPARISON OF DPX E2Y45 TO MERIT AND ARENA AS A MID-SUMMER CURATIVE TEST AGAINST EUROPEAN CHAFER,... (G25) BLUEGRASS (KENTUCKY): Poa pratensis L. FESCUE (RED): Festuca rubrum L. COMPARISON OF DPX E2Y45 TO MERIT AND ARENA AS A MID-SUMMER CURATIVE TEST AGAINST EUROPEAN CHAFER, 2006 Stanley R. Swier University of New Hampshire (UNH) Dept. of Plant Biology 254 Spaulding Hall Durham, NH 03824-3544 Phone: (603) 862-1733 Fax: (603) 862-1713 E-mail: stanley.swier@unh.edu Alan Rollins European Chafer (EC): Rhizotrogus majalis Razoumowsky This trial was conducted on a lawn at the Kingman Research Farm (UNH), Madbury, NH. The trial was split into early and late Aug applications (7 Aug and 28 Aug). The grass was maintained at a ht 2.5 inches on an as-needed basis and was cut two d prior to applications. All treatments were applied to 49 ft plots, replicated four times in a RCB design, using an R&D EXD dual-wheel sprayer, with a 7 ft boom and four 8004 flat fan-pattern nozzles fitted with 50-mesh screens. CO was used to deliver the solution at 40 psi. The vol of insecticide and water was 2 gal/1000 ft . All treatments were hand-irrigated with approximately 0.25 inch of water, within one h after applications. There was no precipitation within 24 h prior to applications, and there was 0.1 inch of rain within 24 h after applications. Soil structure was as follows: texture, loam; sand, 41%; silt, 48%; clay, 11%; thatch, 1-inch; and organic matter, 7.7%. Weather and soil conditions at time of application on 7 Aug: sky, clear; wind, less than 5mph; air temp, 83°F; soil surface temp, 84°F; at 1 inch depth, 81°F; at 2 inch depth, 81°F; soil pH, 5.4; and soil moisture, 22.4%. Weather and soil conditions at time of application on 28 Aug: sky, overcast; wind, calm; air temp, 69°F; soil surface temp, 71°F; at 1 inch depth, 68°F; at 2 inch depth, 68°F; soil pH, 5.6; and soil moisture, 28.9%. The trial was rated for live EC grubs on 11 Oct. A Ryan Jr. Sod Cutter, equipped with a 12-inch blade was used to cut through the center of each plot, one inch deep. A 3 ft section of the cut turf was rolled back to reveal the grubs. Southern New Hampshire experienced record rainfall in 2006, about 25 inches through May and Jun. Consequently, grub populations were much lower than normal. All of the 7 Aug treatments performed better than the 70% minimum threshold of control. On 28 Aug, the low rate of DPX E2Y45 1.67SC fell below the 70% threshold, and was not significantly different than the untreated checks. The standards, Merit 75WP and Arena 50WDG, and the high rate of DPX E2Y45 1.67SC (0.26 lb (AI)/acre) provided excellent control (over 90%), No phytotoxicity was observed. Rate Application Mean no. Treatment/formulation lb (AI)/acre date EC grubs/3 ft % control DPX E2Y45 1.67SC 0.052 7 Aug 2.25bc 72.7 DPX E2Y45 1.67SC 0.104 7 Aug 2.00bc 75.8 DPX E2Y45 1.67SC 0.157 7 Aug 1.75abc 78.8 DPX E2Y45 1.67SC 0.209 7 Aug 1.25ab 84.9 DPX E2Y45 1.67SC 0.26 7 Aug 0.75ab 90.9 Merit 75WP 0.30 7 Aug 0.50ab 93.9 Arena 50WDG 0.33 7 Aug 0.00a 100.0 DPX E2Y45 1.67SC 0.052 28 Aug 4.5cd 45.5 DPX E2Y45 1.67SC 0.104 28 Aug 1.25abc 84.9 DPX E2Y45 1.67SC 0.157 28 Aug 2.50bc 69.7 DPX E2Y45 1.67SC 0.209 28 Aug 2.00bc 77.3 DPX E2Y45 1.67SC 0.26 28 Aug 0.75ab 90.9 Merit 75WP 0.30 28 Aug 0.00a 100.0 Arena 50WDG 0.33 28 Aug 0.00a 100.0 Untreated check - 8.25d Means followed by the same letter are not significantly different; p = 0.05, DMRT. Transformations by the square root of [x]. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

COMPARISON OF DPX E2Y45 TO MERIT AND ARENA AS A MID-SUMMER CURATIVE TEST AGAINST EUROPEAN CHAFER, 2006

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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/32.1.G25
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Abstract

(G25) BLUEGRASS (KENTUCKY): Poa pratensis L. FESCUE (RED): Festuca rubrum L. COMPARISON OF DPX E2Y45 TO MERIT AND ARENA AS A MID-SUMMER CURATIVE TEST AGAINST EUROPEAN CHAFER, 2006 Stanley R. Swier University of New Hampshire (UNH) Dept. of Plant Biology 254 Spaulding Hall Durham, NH 03824-3544 Phone: (603) 862-1733 Fax: (603) 862-1713 E-mail: stanley.swier@unh.edu Alan Rollins European Chafer (EC): Rhizotrogus majalis Razoumowsky This trial was conducted on a lawn at the Kingman Research Farm (UNH), Madbury, NH. The trial was split into early and late Aug applications (7 Aug and 28 Aug). The grass was maintained at a ht 2.5 inches on an as-needed basis and was cut two d prior to applications. All treatments were applied to 49 ft plots, replicated four times in a RCB design, using an R&D EXD dual-wheel sprayer, with a 7 ft boom and four 8004 flat fan-pattern nozzles fitted with 50-mesh screens. CO was used to deliver the solution at 40 psi. The vol of insecticide and water was 2 gal/1000 ft . All treatments were hand-irrigated with approximately 0.25 inch of water, within one h after applications. There was no precipitation within 24 h prior to applications, and there was 0.1 inch of rain within 24 h after applications. Soil structure was as follows: texture, loam; sand, 41%; silt, 48%; clay, 11%; thatch, 1-inch; and organic matter, 7.7%. Weather and soil conditions at time of application on 7 Aug: sky, clear; wind, less than 5mph; air temp, 83°F; soil surface temp, 84°F; at 1 inch depth, 81°F; at 2 inch depth, 81°F; soil pH, 5.4; and soil moisture, 22.4%. Weather and soil conditions at time of application on 28 Aug: sky, overcast; wind, calm; air temp, 69°F; soil surface temp, 71°F; at 1 inch depth, 68°F; at 2 inch depth, 68°F; soil pH, 5.6; and soil moisture, 28.9%. The trial was rated for live EC grubs on 11 Oct. A Ryan Jr. Sod Cutter, equipped with a 12-inch blade was used to cut through the center of each plot, one inch deep. A 3 ft section of the cut turf was rolled back to reveal the grubs. Southern New Hampshire experienced record rainfall in 2006, about 25 inches through May and Jun. Consequently, grub populations were much lower than normal. All of the 7 Aug treatments performed better than the 70% minimum threshold of control. On 28 Aug, the low rate of DPX E2Y45 1.67SC fell below the 70% threshold, and was not significantly different than the untreated checks. The standards, Merit 75WP and Arena 50WDG, and the high rate of DPX E2Y45 1.67SC (0.26 lb (AI)/acre) provided excellent control (over 90%), No phytotoxicity was observed. Rate Application Mean no. Treatment/formulation lb (AI)/acre date EC grubs/3 ft % control DPX E2Y45 1.67SC 0.052 7 Aug 2.25bc 72.7 DPX E2Y45 1.67SC 0.104 7 Aug 2.00bc 75.8 DPX E2Y45 1.67SC 0.157 7 Aug 1.75abc 78.8 DPX E2Y45 1.67SC 0.209 7 Aug 1.25ab 84.9 DPX E2Y45 1.67SC 0.26 7 Aug 0.75ab 90.9 Merit 75WP 0.30 7 Aug 0.50ab 93.9 Arena 50WDG 0.33 7 Aug 0.00a 100.0 DPX E2Y45 1.67SC 0.052 28 Aug 4.5cd 45.5 DPX E2Y45 1.67SC 0.104 28 Aug 1.25abc 84.9 DPX E2Y45 1.67SC 0.157 28 Aug 2.50bc 69.7 DPX E2Y45 1.67SC 0.209 28 Aug 2.00bc 77.3 DPX E2Y45 1.67SC 0.26 28 Aug 0.75ab 90.9 Merit 75WP 0.30 28 Aug 0.00a 100.0 Arena 50WDG 0.33 28 Aug 0.00a 100.0 Untreated check - 8.25d Means followed by the same letter are not significantly different; p = 0.05, DMRT. Transformations by the square root of [x].

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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