Timing Effect on Performance of RH0345, Merit 75WP, Tempo 2, and Dursban Pro for Management of Black Cutworm of Creeping Bentgrass, 1996

Abstract

Listen

Translate article

Abstract Treatment plots were 6X10 ft, arranged in a RCB design and replicated 4 times at Uni versity 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 208 ml of water/60 ft2 or delivering 0.92 gal/1,000 ft2. At the 1st treatment on 23 Aug, the following soil and environmen tal conditions existed: air temperature, 66°F; soil temperature at 1 inch depth, 62°F; soil temperature at 2 inch depth, 64°F; RH, 97%; amount of thatch 0.125-0.25 inch; soil textural class, sandy loam; soil particle size analysis: 58.2% sand, 33.9% silt, 7.9% clay; soil moisture (oven dry weight), 18.6%; or ganic matter, 2.7%; water pH, 7.0; soil pH, 6.8%; time of application, early morning; and clear skies. A total of 0.8 inch of rain fell between late evening on 23 Aug through early morning on 24 Aug. At the 2nd treatment on 6 Sep, the following soil and environmental conditions existed: air temperature 67°F; soil temperature at 1 inch depth, 65°F; soil temperature at 2 inch depth, 65°F; RH, 87%; amount of thatch, 0.125-0.25 inch; soil textural class, sand) loam; soil particle size analysis: 58.2% sand, 33.9% silt, 7.9% clay; soil moisture (oven dry weight), 26.9%; organic matter, 2.8%; water pH, 7.0; soil pH 6.4; time of application, early morning; and overcast skies. A total of 2.7 inches of rainfall was recorded over a 72-h interval following the second treat ment on 6 Sep; however, the area did have 8 h drying time prior to the latter rainfall. Evaluation was done on 9 Sep and 12 Sep by counting the number o: 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. An average of 16/yd2 cutworm larvae was recorded on 4 Sep following infestation of the experimental area with 2nd and 3rt instar black cutworms. The entire experimental area was covered with bird netting until posttreatment counts were recorded on 9 Sep.