Response of Creeping Bentgrass Greens to Fall Applications of Bensulide and Dithiopyr. (C05-hart206994-oral)
Authors:
S.E. Hart* - Rutgers, The State University of New Jersey D.W. Lycan - Rutgers, The State University of New Jersey J.A. Murphy - Rutgers, The State University of New Jersey
Abstract:
The preemergence herbicides bensulide and dithiopyr may be used in late summer/fall as a preventative treatment to reduce the potential of annual bluegrass (Poa annua L.) encroachment onto newly
constructed or renovated creeping bentgrass (Agrostis stolonifera L.) greens. Field experiments were conducted from 1999 to 2001 in New Jersey to evaluate the response of pure stands of 'L-93' creeping bentgrass to September or October applications of bensulide (5.5, 11.0, or 22.1 kg/ha) or dithiopyr (0.21, 0.42 or 0.84 kg/ha). Creeping bentgrass was grown in a sand and peat root zone mixture, conforming to United States Golf Association guidelines. Plots were evaluated for percent creeping bentgrass cover at one month after treatment (MAT) and the following spring. Four cores were also sampled from each plot at a depth of 15 cm to determine root mass. In 1999, no herbicide treatment reduced bentgrass cover or root mass at 1 MAT. In the spring of 2000, bentgrass cover remained unaffected, but root mass was lower when bensulide was applied at 22.1 kg/ha or dithiopyr was applied at all rates. Dithiopyr treatments at 0.41 and 0.84 kg/ha in the fall of 2000 reduced bentgrass cover and root mass 1 MAT and the following spring. These results suggest that bensulide may be used on creeping bentgrass greens in the fall with a greater degree of safety than dithiopyr.
Speaker Information: Stephen Hart, Rutgers, The State University of New Jersey, Dept. of Plant Bio. and Path. 59 Dudley Rd.-Foran, New Brunswick, NJ 08901; Phone: (732)932-9711 x 166; E-mail:
Session Information: Tuesday, November 4, 2003, 12:25 PM-2:40 PM Presentation Start: 1:55 PM
Keywords: creeping bentgrass; bensulide; dithiopyr; herbicide response
