Management of Black Cutworm on Creeping Bentgrass with Experimental Formulations, Tempo 20Wp, and Dursban Pro, 1996

Treatment plots were 6 X 10 ft, arranged in a RCB design and replicated 4 times at University Park, PA. Liquid formulations were applied by using a CO2 compressed air sprayer with 4 8002VS TeeJet nozzles mounted on a 6 ft boom, operating at 28 psi, and applied in 454 ml of water/60 ft2 or delivering 2.0 gal/1,000 ft2. Treatments were applied on 15 Aug following artificial infestation of research area with 2nd and 3rd instar black cutworms. An average of 16/yd2 cutworm larvae was recorded on 13 Aug prior to treatment. The entire experimental area was covered with bird netting until post-treatment counts were recorded on 17 Aug. At treatment time (15 Aug) the following soil and environmental conditions existed: air temperature, 70°F; soil temperature at 1 inch depth, 64°F; soil temperature at 2 inch depth, 64°F; RH, 93%; amount of thatch, 0.0625 inch; soil textural class, loam; soil particle size analysis; 51.0% sand, 40.6% silt, 8.4% clay; soil moisture (oven dry weight), 23.9%; organic matter, 3.9%; watei pH, 7.0; soil pH, 6.1%; time of application, mid-afternoon; and overcast skies. A total of 2.6 inch of rainfall occurred after treatments had been applied Evaluation was done 2 DAT (17 Aug) and 6 DAT (21 Aug) by counting the number of black cutworm larvae flushed to the surface within a 1.0 yd2 wood frame sampling area using a soap irritant drench of 30 ml Lemon Joy™ dishwashing detergent in 2 gal of water.