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Arthropod Management Tests 2009, Vol. 34 doi: 10.4182/amt.2009.G17 (G17) BLUEGRASS (KENTUCKY): Poa pratensis L EFFICACY OF ARENA FORMULATIONS TO PREVENTIVELY SUPPRESS SCARAB WHITE GRUBS WHEN APPLIED AT PEAK ADULT BEETLE FLIGHT, 2008 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 (JB): Popillia japonica Newman Northern masked chafer (NMC): Cyclocephala borealis Arrow This study was undertaken to determine the product’s effectiveness when applied in mid Jul to control a predominant Japanese beetle white grub population on a turfgrass area maintained at Penn State’s Valentine Turfgrass Research Center. The turfgrass area consisted of Kentucky bluegrass (100%). 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 boom, operating at 32 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 (14 Jul) the following soil and environmental conditions existed: air temp, 71°F; soil temp at l inch depth, 70 °F; soil temp at 2 inch, 68 °F; RH, 52%; amt of thatch, 0.5 inch; water pH, 7.0; application time, mid-morning; soil, moist; thatch, moist; and clear skies. General soil conditions were as follows: soil textural class, silt loam; soil particle size analysis: sand, 16.2%; silt, 71.3%; clay, 12.4%; soil percent water content (percent by wt), 27.2; organic matter, 4.1%; CEC, 10.8; and soil pH, 6.4. The experimental area received 0.25 inch post treatment irrigation immediately after treatment. Throughout the summer and early fall the area was irrigated on an as needed basis. Three one ft soil samples were removed from each replicate on 16 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 JB and NMC grubs during the spring of 2008 with an avg of 21.6/ft white grubs present in late Apr. Fall 2008 grub populations may have been suppressed by the extremely dry summer weather. Adult NMC’s were monitored in 2008 with a black light trap maintained at the Valentine Turfgrass Research Center, while JB populations were monitored with floral/sex pheromone traps. Adult JB and NMC populations were late this year. All treatments provided significant suppression of JB and NMC grubs. No phytotoxicity was noted. Table 1 Avg no. white grubs/1 ft Treatment/ Rate a a ab formulation lb (AI)/acre JB grubs NMC grubs Tt grubs Arena 50WDG 0.20 0.0b (100.0) 0.0b (100.0) 0.0b (100.0) Arena 0.25G 0.20 0.0b (100.0) 0.0b (100.0) 0.0b (100.0) Untreated check --- 12.6a 1.0a 13.6a Means followed by the same letter are not significantly different (P = 0.05; WD). ( ) Percent reduction of grub population. Combination of JB and NMC grubs.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2009
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