(G11) BLUEGRASS (ANNUAL): Poa annua L RYEGRASS (PERENNIAL): Lolium perenne L. CURATIVE APPLICATIONS WITH CONSERVE, DYLOX, AND TEMPO TO SUPPRESS FIRST GENERATION ANNUAL BLUEGRASS WEEVIL LARVAE, 2006 P.R. Heller Department of Entomology Pennsylvania State University University Park, PA 16802 Phone: 814-865-3008 Fax: 814-865-3048 E-mail: email@example.com D. Kline E-mail: firstname.lastname@example.org Annual bluegrass weevil: Listronotus maculicollis (Dietz) This study was undertaken to determine the product effectiveness of four registered insecticides to curatively suppress first generation annual bluegrass weevil larvae (ABW) on a public golf course fairway adjacent to the rough in Lewisburg. The turfgrass area consisted of annual bluegrass (80%) and perennial ryegrass (20%). Treatment plots were 6 x 4 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 28 psi, and applied in 182 ml of 2 2 water/24 ft or delivering 2.0 gal/1000 ft . At treatment time (24 May) the following soil and environmental conditions existed: air temp, 65°F; soil temp at l inch depth, 58°F; soil temp at 2 inch depth, 54°F; RH, 32%; amt of thatch, 0.125 inch; water pH, 7.0; application time, late morning; soil, moist; thatch, moist; and clear skies. The experimental area was irrigated in with 0.1 inch of water immediately after application. General soil conditions were as follows: soil textural class, loam; soil particle size analysis: sand, 42.8%; silt, 46.9%; clay, 10.3%; soil percent water content (percent by wt), 24.0; organic matter, 5.5%; CEC, 13.9; and soil pH, 5.1. Two 4 inch cup cutter sod samples were removed from each replicate on 7 Jun. The total no. of ABW pupae and larvae was recorded from both samples and converted to 2 ft . 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 ABW during 2005 and 2006. Young ABW larvae were recorded on 24 May from the experimental area. Various larval instars were present on 7 Jun which may be attributed to periods of fluctuating spring temp. Two treatments, respectively Dylox 80 and Conserve SC, provided significant curative larval control. No phytotoxicity was noted. Avg no. life stages/2 ft Treatment/ Rate formulation amt form/acre ABW (% reduction) Untreated check --- 38.3a Tempo GC 20WP 10.2 oz 30.7a (19.8) Tempo Ultra 12.0 fl oz 15.3ab (60.0) Dylox 80 T & O 163.0 oz 3.8b (90.1) Conserve SC 52.0 fl oz 3.8b (90.1) Means followed by the same letter are not significantly different (P = 0.05; WD).
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2007