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(G23) BLUEGRASS (KENTUCKY): Poa pratensis L FESCUE (FINE): Festuca sp. MID-JULY APPLICATION OF ACELEPRYN AND MERIT FORMULATIONS TO PREVENTIVELY 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 in mid-Jul to control a predominant population of northern masked chafer (NMC) and Japanese beetle (JB) white grubs 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 x 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 boom, operating at 2 2 28 psi, and applied in 726 ml of water/48 ft or delivering 4.0 gal/1000 ft . At treatment time (10 Jul) the following soil and environmental conditions existed: air temp, 74°F; soil temp at l inch depth, 68°F; soil temp at 2 inch, 62°F; RH, 79%; amt of thatch, 0.25 inch; water pH, 7.0; application time, mid morning; soil, dry; thatch, dry; and clear skies. General soil conditions were as follows: soil textural class, clay loam; soil particle size analysis: sand, 20.4%; silt, 45.9%; clay, 33.7%; soil percent water content (percent by wt), 14.8; organic matter, 8.1%; CEC, 21.9; and soil pH, 6.1. The experimental area received 0.25 inch post treatment irrigation immediately after treatment. Three one ft soil samples were removed from each replicate on 3 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 14.37/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 – 3 Oct, zero. All treatments provided significant suppression of NMC grubs. An insufficient JB grub population was present; hence, no treatments provided significant reduction because of an extremely low population of only 0.7 JB grubs/ft in untreated checks. No phytotoxicity was noted. Table 1. Avg no. white grubs/3 ft Treatment/ Rate a b formulation lb (AI)/acre JB grubs NMC grubs Total Acelepryn 1.67SC 0.104 0.7a 0.7b 1.3b (93.0) Acelepryn 1.67SC 0.157 0.0a 0.0b 0.0b (100.0) Acelepryn 1.67SC 0.209 0.3a 0.0b 0.3b (98.4) Merit 75WP 0.3 0.3a 0.0b 0.3b (98.4) Untreated check --- 2.0a 16.7a 18.7a Means followed by the same letter are not significantly different (P = 0.05; WD). Combination of JB and NMC grubs. ( ) Percent reduction.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2008
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