Abstract
Abstract In-secticides were evaluated for control of chinch bugs on a buffalograss seed production field near Murdock, NE. The turf (100% buffalograss) was maintained unmowed but was cut to a height of 2 inches prior to insecticide applications. Thatch accumulation (finger compressed) in the plot area was less than 0.125 inches. 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 11%; air temperature 80° F; soil temperature 79° F; relative humidity 73%; wind direction and velocity 126° at 6 mph. Plots were 6 X 10 ft and the experimental design was a RCB with 4 replications. Insecticide treatments were applied on 27 Aug 1997. Granular treatments were applied by using a pre-calibrated 24H12 Gandy spreader. Liquid insecticides were applied using a CO2 sprayer with a TeeJet® 8002 nozzle at 30 psi and delivering 87 gpa finished spray. Post-treatment irrigation involved application of 0.5 or 0.125 inches water to designated plots using a sprinkling can. A total of 1.53 inches of rain fell during the post-treatment period. Treatments were evaluated 3, 7, and 21 DAT (30 Aug, 4, and 18 Sep) by removing from each plot three, 4.25-inch-diam turf-soil cores (0.3 ft2 total area) to a depth of 1 inch. Cores were placed in Berlese funnels and extracted chinch bugs were counted after 48 hr. Pre-treatment estimate of insect activity was 30+ chinch bugs/ft2.
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