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CURATIVE TIMING APPLICATION OF INSECT PARASITIC NEMATODES AND DYLOX 6.2G TO SUPPRESS SCARAB WHITE GRUBS, 2007

CURATIVE TIMING APPLICATION OF INSECT PARASITIC NEMATODES AND DYLOX 6.2G TO SUPPRESS SCARAB WHITE... (G24) BLUEGRASS (KENTUCKY): Poa pratensis L FESCUE (TALL): Festuca sp. CURATIVE TIMING APPLICATION OF INSECT PARASITIC NEMATODES AND DYLOX 6.2G TO SUPPRESS SCARAB WHITE GRUBS, 2007 P.R. Heller Department of Entomology Pennsylvania State University University Park, PA 16802 Phone: 814-865-3008 Fax: 814-865-3048 E-mail: prh@psu.edu D. Kline E-mail: dek16@psu.edu A. Houseman E-mail: adh5008@psu.edu Japanese beetle: Popillia japonica Newman Northern masked chafer: Cyclocephala borealis Arrow This study was undertaken to determine product effectiveness when applied to curatively control a predominant northern masked chafer (NMC) and Japanese beetle (JB) white grub populations on a turfgrass rough area maintained parallel with a golf course fairway in Lewistown. The turfgrass area consisted of Kentucky bluegrass (90%) and tall fescue (10%). Treatment plots were 6 x 8 ft, arranged in a RCB design and replicated three times with a 1 ft barrier around all replicates. Insect parasitic nematodes were applied with a CO sprayer with four 8002VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, but spray screens were removed and applied in 542 ml of water/48ft or delivering 130 gal/acre. Granular applications were applied with a drop spreader. At treatment time (13 Sep) the following soil and environmental conditions existed: air temp, 64°F; soil temp at l inch depth, 64°F; soil temp at 2 inch, 66°F; RH, 64%; amt of thatch, 0.25 inch; water pH, 7.0; application time, late morning; soil, moist; thatch, moist; amt of thatch, 0.25; and skies, clear. General soil conditions were as follows: soil textural, silt loam; soil particle size analysis: sand, 36.5%; silt, 52.0%; clay, 11.5%; soil percent water content (percent by wt), 25.5; organic matter, 5.5%; CEC, 15.5; and soil pH, 5.4. The experimental area received 0.25 inch irrigation immediately after treatment. Three one ft soil samples were removed from each replicate on 27 Sep and the total no. of JB and NMC grubs was recorded. Data were analyzed with ANOVA and the mean separation test used was WD. The area selected for the experiment had been infested with a natural population of NMC and JB grubs during the fall of 2007, and grubs were actively feeding at the time of application. An avg of 20.7 grubs/ft were recorded prior to treatment. Adult NMC’s were monitored in 2007 with a black light trap maintained at the Valentine Turfgrass Research Center. Peak NMC adult flight was recorded from 22 Jun through 9 Jul. Drought conditions negatively impacted the development and survival of scarab grubs at the research site location. Rainfall data recorded over the duration of the experiment included 0.45 inch on 15 Sep. No treatment provided significant reduction of JB grubs, while only Dylox 6.2G and the low rate of Steinernema feltiae provided significant reduction of NMC grubs. No phytotoxicity was noted. Table 1. Avg no. white grubs/ft Treatment/ Rate formulation form/area JB grubs NMC grubs Steinernema carpocapsae 1 billion/acre 12.2a 11.4ab Steinernema carpocapsae 2 billion/acre 8.3a 7.1ab Steinernema feltiae 1 billion/acre 15.2a 3.6b Steinernema feltiae 2 billion/acre 8.7a 14.7a Dylox 6.2G 3 lb/1000 ft 4.9a 2.1b Untreated check --- 8.9a 12.2ab Means followed by the same letter are not significantly different (P = 0.05; WD). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CURATIVE TIMING APPLICATION OF INSECT PARASITIC NEMATODES AND DYLOX 6.2G TO SUPPRESS SCARAB WHITE GRUBS, 2007

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Publisher
Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/33.1.G24
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Abstract

(G24) BLUEGRASS (KENTUCKY): Poa pratensis L FESCUE (TALL): Festuca sp. CURATIVE TIMING APPLICATION OF INSECT PARASITIC NEMATODES AND DYLOX 6.2G TO SUPPRESS SCARAB WHITE GRUBS, 2007 P.R. Heller Department of Entomology Pennsylvania State University University Park, PA 16802 Phone: 814-865-3008 Fax: 814-865-3048 E-mail: prh@psu.edu D. Kline E-mail: dek16@psu.edu A. Houseman E-mail: adh5008@psu.edu Japanese beetle: Popillia japonica Newman Northern masked chafer: Cyclocephala borealis Arrow This study was undertaken to determine product effectiveness when applied to curatively control a predominant northern masked chafer (NMC) and Japanese beetle (JB) white grub populations on a turfgrass rough area maintained parallel with a golf course fairway in Lewistown. The turfgrass area consisted of Kentucky bluegrass (90%) and tall fescue (10%). Treatment plots were 6 x 8 ft, arranged in a RCB design and replicated three times with a 1 ft barrier around all replicates. Insect parasitic nematodes were applied with a CO sprayer with four 8002VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, but spray screens were removed and applied in 542 ml of water/48ft or delivering 130 gal/acre. Granular applications were applied with a drop spreader. At treatment time (13 Sep) the following soil and environmental conditions existed: air temp, 64°F; soil temp at l inch depth, 64°F; soil temp at 2 inch, 66°F; RH, 64%; amt of thatch, 0.25 inch; water pH, 7.0; application time, late morning; soil, moist; thatch, moist; amt of thatch, 0.25; and skies, clear. General soil conditions were as follows: soil textural, silt loam; soil particle size analysis: sand, 36.5%; silt, 52.0%; clay, 11.5%; soil percent water content (percent by wt), 25.5; organic matter, 5.5%; CEC, 15.5; and soil pH, 5.4. The experimental area received 0.25 inch irrigation immediately after treatment. Three one ft soil samples were removed from each replicate on 27 Sep and the total no. of JB and NMC grubs was recorded. Data were analyzed with ANOVA and the mean separation test used was WD. The area selected for the experiment had been infested with a natural population of NMC and JB grubs during the fall of 2007, and grubs were actively feeding at the time of application. An avg of 20.7 grubs/ft were recorded prior to treatment. Adult NMC’s were monitored in 2007 with a black light trap maintained at the Valentine Turfgrass Research Center. Peak NMC adult flight was recorded from 22 Jun through 9 Jul. Drought conditions negatively impacted the development and survival of scarab grubs at the research site location. Rainfall data recorded over the duration of the experiment included 0.45 inch on 15 Sep. No treatment provided significant reduction of JB grubs, while only Dylox 6.2G and the low rate of Steinernema feltiae provided significant reduction of NMC grubs. No phytotoxicity was noted. Table 1. Avg no. white grubs/ft Treatment/ Rate formulation form/area JB grubs NMC grubs Steinernema carpocapsae 1 billion/acre 12.2a 11.4ab Steinernema carpocapsae 2 billion/acre 8.3a 7.1ab Steinernema feltiae 1 billion/acre 15.2a 3.6b Steinernema feltiae 2 billion/acre 8.7a 14.7a Dylox 6.2G 3 lb/1000 ft 4.9a 2.1b Untreated check --- 8.9a 12.2ab Means followed by the same letter are not significantly different (P = 0.05; WD).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2008

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