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(G13) BLUEGRASS (KENTUCKY): Poa pratensis L FESCUE (FINE): Festuca sp. PREVENTIVE TIMING STUDY WITH MERIDIAN AND MERIT FORMULATIONS 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 at peak adult emergence to control a predominant northern masked chafer (NMC) and Japanese beetle (JB) white grub population on a turfgrass area maintained on a golf course driving range in Mingoville. The turfgrass area consisted of Kentucky bluegrass (10%) and fine fescue (90%). Treatment plots were 6 × 8 ft, arranged in a RCB design and replicated three times with a 1 ft barrier around all replicates. Liquid formulations were applied by using a CO sprayer with four 8002VS TeeJet nozzles mounted on a 6 ft 2 2 boom, operating at 28 psi, and applied in 363 ml of water/48 ft or delivering 2.0 gal/1000 ft . Granular formulations were applied with a hand-held shaker and mixed with fine top dressing sand to facilitate product distribution. At treatment time one (3 Jul) the following soil and environmental conditions existed: air temp, 65°F; soil temp at l inch depth, 61°F; soil temp at 2 inch, 63°F; RH, 53%; amt of thatch, 0.25 inch; water pH, 7.0; application time, mid-morning; soil, dry; thatch, dry; and cloudy skies. General soil conditions were as follows: soil textural class, clay loam; soil particle size analysis: sand, 23.3%; silt, 47.4%; clay, 29.3%; soil percent water content (percent by wt), 15.7; organic matter, 7.2%; CEC, 22.3; and soil pH, 5.9. The experimental area received 0.25 inch post treatment irrigation immediately after treatment. Three one ft soil samples were removed from each replicate on 4 Oct and the total no. JB and NMC grubs was recorded and converted to a three ft count. 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 spring of 2007 with an avg of 16.6/ft grubs present. Adult NMC’s were monitored in 2007 with a black light trap maintained at the Valentine Turfgrass Research Center. The first adult NMC was collected on 14 Jun. Peak NMC adult flight was recorded from ca. 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: 21 May – 31 May, 0.75 inch; 1 Jun – 30 Jun, 2.55 inches; 1 Jul – 31 Jul, 2.85 inches; 1 Aug – 31 Aug, 6.25; 1 Sep – 30 Sep, 2.2 inches; and 1 Oct – 16 Oct, zero. All treatments provided significant suppression of JB and NMC grubs. No phytotoxicity was noted. Table 1. Avg no. white grubs/3 ft Treatment/ Rate a ab formulation form/acre JB grubs NMC grubs Meridian 25WG 17.0 oz 0.0b (100%) 0.0b (100%) Meridian 25WG 12.7 oz 0.0b (100%) 0.0b (100%) Meridian 0.33G 80.0 lb 0.0b (100%) 0.0b (100%) Merit 75WP 6.4 oz 0.3b (95.0%) 0.0b (100%) Untreated check --- 6.0a 9.7a Means followed by the same letter are not significantly different (P = 0.05; WD). ( ) Percent reduction. Data transformed to a log transformation prior to ANOVA/WD. Untransformed means are presented in the table.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2008
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