Summer Management of Hairy Chinch Bug with Formulations of Chlorpyrifos on Established Fescue Turfgrass in Somerset, Pennsylvania, 1995
Abstract The turfgrass area consisted primarily of fine leafed fescue. Treatment plots were 5 X 6 ft arranged in a randomized complete block design, replicated 3 times. Liquid formulations were applied by using a a CO2 compressed air sprayer with 4 8004VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and applied in 340 ml of water/30 ft2 or delivering 2 gal (1000 ft2). At treatment time (2 Aug) the following soil and environmental conditions existed: air temperature, 79° F; soil temperature at 1 inch depth, 90° F; soil temperature at 2 inch depth, 82° F; RH, 70%; amount of thatch, 0.75-1.5 inches; soil textural class, loam; soil particle size analysis: 33.5% sand, 48.3% silt, 18.2% clay; soil moisture (oven dry weight), 9.5%; organic matter, 6.5%; water pH, 7.0; soil pH, 5.9; application time, late afternoon; and overcast skies. Immediately after treatment the experimental area was irrigated with 0.1 inch of water. Hairy chinch bugs were sampled by driving a 6 inch-diam stainless steel cylinder into the turf, filling it with water, and counting the number of chinch bug nymphs and adults floating to the surface during a 10 min period (sampling dates: 8, 17, 30 Aug). Three flotation samples were taken randomly from each replicate, and the total number of chinch bugs from each sample was recorded and converted to a ft2 count.