Reduced Rates of Dursban Combined with Sunspray Ultrafine Spray Oil for Control of Chinch Bugs on Buffalograss, 1991

The experiment was conducted on a buffalograss lawn in Lincoln, NE. Insecticides were applied on 15 Aug to 1.2 x 1.2 m plots arranged in a RCB design with 4 replications. Buffalograss was maintained at a mowing height of 10.2 cm and mowed to 5.1 cm prior to insecticide applications. Thatch accumulation ranged from 0 to 0.64 cm. Conditions at the time of application were as follows; air temperature 33°C; soil temperature (10.2 cm depth) 30°C; soil type, silty clay loam; soil organic matter, 3-5%; soil pH, 6.0-7.0; water pH, 7.0; soil moisture 11%. Insecticides were applied with a CO2 sprayer using a LF-4 nozzle at 165.5 KPa and delivering 18.9 liter spray/93 m2. Immediately following application, plots were irrigated with 0.325 cm water. No rainfall occurred during the post-treatment period. Product efficacy was evaluated 5 DAT (20 Aug) by removing from each plot three turf-soil cores to a depth of 2.54 cm with a 10.8 cm diam cup cutter (0.03 m2 total area per plot). Cores were returned to the laboratory and placed in Berlese funnels. Extracted chinch bugs were counted after 48 h.