(G12) BLUEGRASS (KENTUCKY): Poa Pratensis L. W.G. Anderson Department of Entomology University of Nebraska-Lincoln 202 Plant Industry Bldg Lincoln, NE 68583-0816 Phone (402) 472-8699 Fax (402) 472-4687 E-mail: firstname.lastname@example.org F.P. Baxendale E-mail: email@example.com T.E. Eickhoff E-mail: firstname.lastname@example.org T.M. Heng-Moss Email: email@example.com Bluegrass billbug (BB): Sphenophorus parvulus Gyllenhal Southern masked chafer (SMC): Cyclocephala immaculata (Olives) Insecticides were evaluated for control of BB and SMC on plots located at the University of Nebraska Agricultural Research and Development Center near Mead, NE. The turf (100% Kentucky bluegrass) was maintained at a ht of 2.5 inches. Thatch accumulation (finger compressed) in the plot area was 0.25 inch. Field conditions at the study site were: soil type, silty clay loam; soil organic matter, 3–5%; soil pH, 6–7; water pH, 7.0. Environmental conditions at the time of treatment were as follows: soil moisture 24% (7 May), 27% (4 Jun) and 16% (9 Jul); air temp 69°F (7 May), 62°F (4 Jun) and 82°F (9 Jul); soil temperature 67°F (7 May), 63°F (4 Jun) and 84°F (9 Jul); relative humidity 44% (7 May), 70% (4 Jun) and 69% (9 Jul); wind direction and velocity 124° at 4.7 mph (7 May), 189° at 4.1 mph (4 Jun), and 234° at 6.8 mph (9 Jul). Plots were 8 × 8 ft and the experimental design was a RCB with 3 replications. Insecticide treatments were applied on 7 May, 4 Jun and 9 Jul. Liquid products were applied using a CO sprayer at 40 psi and applying 131 gpa finished spray. Post-treatment irrigation was 0.15 inch. A total of 6.7 inches of rain accumulated during the post-treatment period. Treatments were evaluated 62 DAT (8 Jul for BB) and 111 (26 Aug for SMC) by removing from each plot three, 8-inch diameter turf-soil cores (1.05 ft² total area) to a depth of 3 inches and counting the no. of surviving BB and SMC. Data were analyzed using ANOVA and means were seperated using LSD (P ≤ 0.05). Merit treatments on all application dates provided statistically significant reduction of BB numbers when compared to the untreated check. Merit treatments on all application dates provided statistically significant reduction of SMC numbers when compared to the untreated check (Table 2.). No phytotoxicity was observed.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2004