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1 October 2004 Response of Creeping Bentgrass (Agrostis stolonifera) to Fall Applications of Bensulide and Dithiopyr
STEPHEN E. HART, DARREN W. LYCAN, JAMES A. MURPHY
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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.

Nomenclature: Bensulide; dithiopyr; annual bluegrass, Poa annua L. #3 POAAN; creeping bentgrass, Agrostis stolonifera L. # AGSST.

Additional index words: Phytotoxicity, turfgrass cover.

Abbreviations: MAT, month after treatment; PRE, preemergence.

STEPHEN E. HART, DARREN W. LYCAN, and JAMES A. MURPHY "Response of Creeping Bentgrass (Agrostis stolonifera) to Fall Applications of Bensulide and Dithiopyr," Weed Technology 18(4), 1072-1076, (1 October 2004). https://doi.org/10.1614/WT-03-246R
Published: 1 October 2004
JOURNAL ARTICLE
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