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DPX E2Y45 FOR CONTROL OF WHITE GRUBS, 2006

DPX E2Y45 FOR CONTROL OF WHITE GRUBS, 2006 (G7) BLUEGRASS (KENTUCKY): Poa pratensis L. L. Toda Department of Entomology University of Nebraska-Lincoln 205A Plant Industry Bldg Lincoln, NE 68583-0816 Phone (402) 472-8702 Fax (402) 472-4687 E-mail: toda_luciana@yahoo.com.br T.E. Eickhoff Phone (402) 472-8702 E-mail: teickhoff2@unl.edu T.M. Heng-Moss Phone (402) 472-8708 E-mail: THENGMOSS2@unl.edu Southern Masked Chafer (SMC); Cyclocephala lurida Bland Insecticides were evaluated for control of Southern Masked Chafers (SMC) on a Kentucky bluegrass research area at the University of Nebraska Agricultural Research and Development Center near Mead, NE. The turf (100% Kentucky bluegrass) was maintained at a ht of 2.5 inches. Thatch accumulation (finger compressed) in the plot area was 0.5 inch. Field conditions at the site were: soil type, silty clay loam; soil organic matter, 3.0-5.0%; soil pH, 6.2-6.6; water pH, 7.0. Environmental conditions at the time of treatment were as follows: soil moisture 13.2%; air temp 72ºF; soil temp 60ºF; relative humidity 39%; and wind velocity, 5 mph. Plots were 5 ft x 5 ft and the experimental design was a RCB with four replications. Insecticides were applied on 16 May. Granule insecticides were applied using a hand shaker. Post-treatment irrigation was 0.25 inch. A total of 9.2 inches of rain accumulated during the post-treatment period. Treatments were evaluated 101DAT (25 Aug) by removing from each plot three, 8-inch diameter turf-soil cores (1.05 ft² total area) to a depth of 3 inches and counting the no. of surviving grubs. All treatments provided statistically significant reductions in SMC no. when compared to the untreated check. However, the treatment DPX E2Y45 SC (0.052 lb (AI)/acre) did not provide acceptable (> 80%) white grub control. No phytotoxicity was observed. Rate 2a Treatment/formulation lb (AI)/acre Mean SMC/ 1.05 ft % control DPXE2Y45 SC 0.26 0.00a 100.0 DPXE2Y45 SC 0.157 0.67a 94.7 DPXE2Y45 SC 0.104 1.00a 92.1 Merit 75WP 0.3 1.67a 86.8 DPXE2Y45 SC 0.209 2.00a 84.2 DPXE2Y45 SC 0.052 2.67a 78.9 Untreated check --- 12.67b --- Means followed by the same letter are not significantly different (P > 0.05, LSD = 7.5). Evaluated 25 Aug (101 DAT) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

DPX E2Y45 FOR CONTROL OF WHITE GRUBS, 2006

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/32.1.G7
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Abstract

(G7) BLUEGRASS (KENTUCKY): Poa pratensis L. L. Toda Department of Entomology University of Nebraska-Lincoln 205A Plant Industry Bldg Lincoln, NE 68583-0816 Phone (402) 472-8702 Fax (402) 472-4687 E-mail: toda_luciana@yahoo.com.br T.E. Eickhoff Phone (402) 472-8702 E-mail: teickhoff2@unl.edu T.M. Heng-Moss Phone (402) 472-8708 E-mail: THENGMOSS2@unl.edu Southern Masked Chafer (SMC); Cyclocephala lurida Bland Insecticides were evaluated for control of Southern Masked Chafers (SMC) on a Kentucky bluegrass research area at the University of Nebraska Agricultural Research and Development Center near Mead, NE. The turf (100% Kentucky bluegrass) was maintained at a ht of 2.5 inches. Thatch accumulation (finger compressed) in the plot area was 0.5 inch. Field conditions at the site were: soil type, silty clay loam; soil organic matter, 3.0-5.0%; soil pH, 6.2-6.6; water pH, 7.0. Environmental conditions at the time of treatment were as follows: soil moisture 13.2%; air temp 72ºF; soil temp 60ºF; relative humidity 39%; and wind velocity, 5 mph. Plots were 5 ft x 5 ft and the experimental design was a RCB with four replications. Insecticides were applied on 16 May. Granule insecticides were applied using a hand shaker. Post-treatment irrigation was 0.25 inch. A total of 9.2 inches of rain accumulated during the post-treatment period. Treatments were evaluated 101DAT (25 Aug) by removing from each plot three, 8-inch diameter turf-soil cores (1.05 ft² total area) to a depth of 3 inches and counting the no. of surviving grubs. All treatments provided statistically significant reductions in SMC no. when compared to the untreated check. However, the treatment DPX E2Y45 SC (0.052 lb (AI)/acre) did not provide acceptable (> 80%) white grub control. No phytotoxicity was observed. Rate 2a Treatment/formulation lb (AI)/acre Mean SMC/ 1.05 ft % control DPXE2Y45 SC 0.26 0.00a 100.0 DPXE2Y45 SC 0.157 0.67a 94.7 DPXE2Y45 SC 0.104 1.00a 92.1 Merit 75WP 0.3 1.67a 86.8 DPXE2Y45 SC 0.209 2.00a 84.2 DPXE2Y45 SC 0.052 2.67a 78.9 Untreated check --- 12.67b --- Means followed by the same letter are not significantly different (P > 0.05, LSD = 7.5). Evaluated 25 Aug (101 DAT)

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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