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CURATIVE APPLICATIONS OF PROVAUNT AND MERIT FORMULATIONS TO SUPPRESS SCARAB WHITE GRUBS, 2004

CURATIVE APPLICATIONS OF PROVAUNT AND MERIT FORMULATIONS TO SUPPRESS SCARAB WHITE GRUBS, 2004 (G32) MIXED TURF: Poa pratensis L. and Lolium perenne L. CURATIVE APPLICATIONS OF PROVAUNT AND MERIT FORMULATIONS TO SUPPRESS SCARAB WHITE GRUBS, 2004 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 Japanese beetle (JB): Popillia japonica Newman Northern masked chafer (NMC): Cyclocephala borealis Arrow This study was undertaken to determine product effectiveness to control a mixed white grub population on a golf course rough maintained at fairway ht near Mingoville. The turfgrass area consisted of 90% Kentucky bluegrass, Poa pratensis L. and 10% perennial ryegrass, Lolium perenne L.. Treatment plots were 6 × 8 ft, arranged in a RCB design and replicated three times. Liquid formulations were applied by using a CO sprayer with four 8002VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and 2 2 applied in 726 ml of water/48 ft or delivering 4.0 gal/1000 ft . At treatment time (10 Aug) the following soil and environmental conditions existed: air temp, 89°F; soil temp at l inch depth, 74°F; soil temp at 2 inch, 70°F; RH, 47%; amt of thatch, 0.25 inch; water pH, 7.0; application time, late morning; soil and thatch, dry; and overcast skies. Immediately after application the experimental area was irrigated in with 0.1 inch of water before thunderstorms moved in and deposited 0.25 inch of liquid precipitation on 10 Aug. One inch of rainfall was recorded from 11 Aug through 12 Aug. General soil conditions were as follows: soil textural class, silt loam; soil particle size analysis: sand, 30.7%; silt, 50.9%; clay, 18.4%; soil percent water content (percent by wt), 23.3; organic matter, 6.1%; CEC, 12.6; and soil pH, 5.6. The experimental area received excessive rainfall throughout the summer and fall. The rainfall totals recorded from 10 Aug through 4 Oct included: 10 Aug, 0.25 inch; 12 Aug, 1.0 inch; 19 Aug, 0.3 inch; 21 Aug, 2.2 inches; 28 Aug, 0.4 inch; 29 Aug, 0.5 inch, 31 Aug, 0.1 inch; 9 Sept 4.6 inches 18 Sept, 7.2 inches; 28 Sep, 2.0 inches; 2 Oct, 0.2 inch; 15 Oct, 0.6 inch; 18 Oct, 0.7 inch; and 20 Oct, 0.2 inch. Three ft soil samples were removed from each replicate on 5 Oct and the total no. of JB and NMC grubs was recorded. Prior to analyses, data were transformed to log transformation. Data was analyzed using ANOVA and means were separated with WD (P ≤ 0.05). The area selected for the experiment had been infested with a natural population of NMC and JB during mid summer 2004 with an avg of 16.8 grubs/ft recorded on 4 Aug. Adult NMC’s were monitored in 2004 with a black-light trap maintained at the Valentine Turfgrass Research Center. The first adult NMC was collected between 14 – 17 Jun. Peak NMC adult flight was recorded from ca. 21 Jun through 1 Jul. Japanese beetle adults were observing flying late through early September. White grub data recorded from a number of select treatments included second instar JB and NMC larvae indicating late oviposition by adult females. Untreated checks only recorded an avg of 47.1% second instar JB grubs and 41.0% NMC grubs. The presence of second instar larvae would indicate late oviposition and/or egg hatch. This could effect the exposure of the insects to the active ingredients present in the soil (i.e., minimal time as larvae), and/or excessive rainfall could have negatively impacted residual activity. Merit 75WP, Provaunt 1.25 SC, and Provaunt 1.25 SC + Silwet L-77 significantly reduced JB grub populations, while only Merit 75WP significantly reduced the combined totals of JB and NMC grub populations. No treatments provided significant reduction of NMC grubs. No phytotoxicity was noted. Avg no. grubs/ft Rate Treatment/ a a ab formulation lb (AI)/acre JB NMC Total Provaunt 1.25SC 0.44 1.8b 10.2abc 12.0ab Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 5.1ab 7.8abc 12.9ab Provaunt 1.25SC + Silwet L-77 0.44 + 0.25% v/v 3.7b 16.9ab 20.6a Provaunt 1.25SC + Induce 0.44 + 0.5% v/v 4.0ab 1.8bc 5.8b Provaunt 1.25SC + SCOIL 0.44 + 1.0% v/v 4.0ab 14.4ab 18.4a Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 4.0ab 20.0a 24.0a + Silwet L-77 + 0.25% v/v Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 3.9ab 8.9abc 12.8ab + Induce + 0.5% v/v Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 4.6ab 11.4abc 16.0ab + SCOIL + 1.0% v/v Merit 75WP 0.3 0.1c 0.1c 0.2c Untreated check --- 7.6a 4.7abc 12.2ab Means in a column followed by the same letter are not significantly different (P > 0.05, WD). Data transformed to log transformation prior to ANOVA/WD. Non-transformed means are presented in the table. Combination of NMC and JB scarab grubs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CURATIVE APPLICATIONS OF PROVAUNT AND MERIT FORMULATIONS TO SUPPRESS SCARAB WHITE GRUBS, 2004

Arthropod Management Tests , Volume 30 (1) – Jan 1, 2005

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10.1093/amt/30.1.G32
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Abstract

(G32) MIXED TURF: Poa pratensis L. and Lolium perenne L. CURATIVE APPLICATIONS OF PROVAUNT AND MERIT FORMULATIONS TO SUPPRESS SCARAB WHITE GRUBS, 2004 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 Japanese beetle (JB): Popillia japonica Newman Northern masked chafer (NMC): Cyclocephala borealis Arrow This study was undertaken to determine product effectiveness to control a mixed white grub population on a golf course rough maintained at fairway ht near Mingoville. The turfgrass area consisted of 90% Kentucky bluegrass, Poa pratensis L. and 10% perennial ryegrass, Lolium perenne L.. Treatment plots were 6 × 8 ft, arranged in a RCB design and replicated three times. Liquid formulations were applied by using a CO sprayer with four 8002VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and 2 2 applied in 726 ml of water/48 ft or delivering 4.0 gal/1000 ft . At treatment time (10 Aug) the following soil and environmental conditions existed: air temp, 89°F; soil temp at l inch depth, 74°F; soil temp at 2 inch, 70°F; RH, 47%; amt of thatch, 0.25 inch; water pH, 7.0; application time, late morning; soil and thatch, dry; and overcast skies. Immediately after application the experimental area was irrigated in with 0.1 inch of water before thunderstorms moved in and deposited 0.25 inch of liquid precipitation on 10 Aug. One inch of rainfall was recorded from 11 Aug through 12 Aug. General soil conditions were as follows: soil textural class, silt loam; soil particle size analysis: sand, 30.7%; silt, 50.9%; clay, 18.4%; soil percent water content (percent by wt), 23.3; organic matter, 6.1%; CEC, 12.6; and soil pH, 5.6. The experimental area received excessive rainfall throughout the summer and fall. The rainfall totals recorded from 10 Aug through 4 Oct included: 10 Aug, 0.25 inch; 12 Aug, 1.0 inch; 19 Aug, 0.3 inch; 21 Aug, 2.2 inches; 28 Aug, 0.4 inch; 29 Aug, 0.5 inch, 31 Aug, 0.1 inch; 9 Sept 4.6 inches 18 Sept, 7.2 inches; 28 Sep, 2.0 inches; 2 Oct, 0.2 inch; 15 Oct, 0.6 inch; 18 Oct, 0.7 inch; and 20 Oct, 0.2 inch. Three ft soil samples were removed from each replicate on 5 Oct and the total no. of JB and NMC grubs was recorded. Prior to analyses, data were transformed to log transformation. Data was analyzed using ANOVA and means were separated with WD (P ≤ 0.05). The area selected for the experiment had been infested with a natural population of NMC and JB during mid summer 2004 with an avg of 16.8 grubs/ft recorded on 4 Aug. Adult NMC’s were monitored in 2004 with a black-light trap maintained at the Valentine Turfgrass Research Center. The first adult NMC was collected between 14 – 17 Jun. Peak NMC adult flight was recorded from ca. 21 Jun through 1 Jul. Japanese beetle adults were observing flying late through early September. White grub data recorded from a number of select treatments included second instar JB and NMC larvae indicating late oviposition by adult females. Untreated checks only recorded an avg of 47.1% second instar JB grubs and 41.0% NMC grubs. The presence of second instar larvae would indicate late oviposition and/or egg hatch. This could effect the exposure of the insects to the active ingredients present in the soil (i.e., minimal time as larvae), and/or excessive rainfall could have negatively impacted residual activity. Merit 75WP, Provaunt 1.25 SC, and Provaunt 1.25 SC + Silwet L-77 significantly reduced JB grub populations, while only Merit 75WP significantly reduced the combined totals of JB and NMC grub populations. No treatments provided significant reduction of NMC grubs. No phytotoxicity was noted. Avg no. grubs/ft Rate Treatment/ a a ab formulation lb (AI)/acre JB NMC Total Provaunt 1.25SC 0.44 1.8b 10.2abc 12.0ab Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 5.1ab 7.8abc 12.9ab Provaunt 1.25SC + Silwet L-77 0.44 + 0.25% v/v 3.7b 16.9ab 20.6a Provaunt 1.25SC + Induce 0.44 + 0.5% v/v 4.0ab 1.8bc 5.8b Provaunt 1.25SC + SCOIL 0.44 + 1.0% v/v 4.0ab 14.4ab 18.4a Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 4.0ab 20.0a 24.0a + Silwet L-77 + 0.25% v/v Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 3.9ab 8.9abc 12.8ab + Induce + 0.5% v/v Provaunt 1.25SC + PBO-8 8EC 0.44 + 1.0% v/v 4.6ab 11.4abc 16.0ab + SCOIL + 1.0% v/v Merit 75WP 0.3 0.1c 0.1c 0.2c Untreated check --- 7.6a 4.7abc 12.2ab Means in a column followed by the same letter are not significantly different (P > 0.05, WD). Data transformed to log transformation prior to ANOVA/WD. Non-transformed means are presented in the table. Combination of NMC and JB scarab grubs.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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