Insecticidal Control of First Generation Chinch Bugs on Buffalograss, 1992

The study was conducted on a buffalograss lawn in Lincoln, NE. The buffalograss was maintained at a mowing height of 10 cm and was mowed to 5 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, 21°C; soil temperature (10-cm depth), 21°C; soil type, silty clay loam; soil organic matter, 3-5%; soil pH, 6.0 to 7.0; water pH, 7.0; soil moisture, near field capacity. Insecticides were applied on 17 Jun to 1.2 x 1.2 m plots arranged in a RCB design with 5 replications. Liquid insecticides were applied with a COa sprayer using a LF-4 nozzle at 165.5 KPa and delivering 18.9 liter spray/93 m2. Granular formulations were applied with a calibrated Grandy 24H12 spreader. Immediately following application, plots were syringed with 0.32 cm of water. Product efficacy was evaluated 5 DAT (22 Jun) by removing from each plot three turf-soil cores to a depth of 1.3 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.