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Response of Creeping Bentgrass (Agrostis stolonifera) to Fall Applications of Bensulide and Dithiopyr

Published online by Cambridge University Press:  20 January 2017

Stephen E. Hart ,
Darren W. Lycan  and
James A. Murphy
Stephen E. Hart*
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, Cook College, New Brunswick, NJ 08901
Darren W. Lycan
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, Cook College, New Brunswick, NJ 08901
James A. Murphy
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, Cook College, New Brunswick, NJ 08901
*
Corresponding author's E-mail: hart@aesop.rutgers.edu
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Abstract

Bensulide and dithiopyr may be used in late summer–fall as a preventative treatment to reduce the potential of annual bluegrass encroachment onto newly constructed or renovated creeping bentgrass putting greens. In 1999, no herbicide treatment reduced bentgrass cover or root mass 1 mo after treatment (MAT). In April of 2000, root mass was lower with bensulide applied at 11.2 kg/ha in October and 22.4 kg/ha applied at both timings or by dithiopyr applied at all rates and timings compared with the untreated bentgrass. In April, bentgrass cover was reduced by bensulide applied at 22.4 kg/ha and dithiopyr applied at 0.4 and 0.8 kg/ha at both timings. In contrast to 1999, significant reductions in root mass were observed 1 MAT in 2000 with bensulide applied at 22.4 kg/ ha and all rates of dithiopyr. Reductions in root mass and bentgrass cover continued into April of 2001 with dithiopyr at 0.4 or 0.8 kg/ha applied at either application timing. Bentgrass cover was lower than the untreated with dithiopyr applied at 0.8 kg/ha until August of 2001. These results suggest that bensulide may be used on creeping bentgrass greens in late summer–fall with a greater degree of safety than dithiopyr.

Keywords

Bensulidedithiopyrannual bluegrass, Poa annua L. #3 POAANcreeping bentgrass, Agrostis stolonifera L. # AGSSTPhytotoxicityturfgrass coverMAT, month after treatmentPRE, preemergence.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1072 - 1076
Copyright
Copyright © Weed Science Society of America 

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