Full TGIF Record # 29259
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):McCarty, L. B.
Author Affiliation:Department of Environmental Horticulture, University of Florida, Gainesville, FL
Title:Metsulfuron for prostrate spurge control in bermudagrass
Meeting Info.:San Antonio, TX: January 14-16, 1991
Source:Southern Weed Science Society Proceedings. Vol. 44, 1991, p. 180.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Keywords:TIC Keywords: Euphorbia supina; Weed control; Cynodon; Herbicides; Comparisons; Phytotoxicity
Abstract/Contents:"Prostrate spurge (Euphorbia maculata) is one of the most difficult to control summer annual weeds for southern bermudagrass (Cynodon spp.) managers due to its prostrate growth habit and ability to thrive in nematode-infested soils. Repeat applications of phenoxy herbicides are currently the major method of postemergence control, often resulting in undesirable bermudagrass phytotoxicity. Research was conducted with three bermudagrass cultivars located at two sites to determine prostrate spurge control and bermudagrass damage following metsulfuron, imazaquin and 2,4-D plus dicamba application. Visual prostrate spurge control was 100% following all rates of metsulfuron (0.016 to 0.044 lb ai/A) over all tests. Weed harvest weight were also negligible for the same treatments. Low imazaquin rates (0.38 lb ai/A) averaged 15% visual control while high rates (0.5 lb/A) averaged 19% control at 10 days after treatment (DAT). 2,4-D plus dicamba (1.0 + 0.5 lb ai/A, respectively) averaged 54% control at the same rating period. Weed harvest weights averaged 24% reduction for low imazaquin rates and 18% reduction for the high rate 14 DAT compared to the untreated. 2,4-D plus dicamba averaged 61% reduction in weed weight at 14 DAT. Bermudagrass tolerance ratings indicated that 'Ormond' bermudagrass was slightly sensitive (ave. 5% phytotoxicity) to metsulfuron while 'Tifway' was unaffected. Acceptable phytotoxicity (15%) followed low imazaquin rates while marginal turf (20% phytotoxicity) followed high imazaquin rates at 10 DAT. 2,4-D plus dicamba also resulted in a degree of Ormond phytotoxicity (12%). Tifway phytotoxicity was unaffected following all treatments. 'Tifdwarf' bermudagrass phytotoxicity was minor (4%) following metsulfuron application while marginal acceptable turf followed both imazaquin rates (21% phytotoxicity) and unacceptable turf (30% phytotoxicity) resulted from 2,4-D plus dicamba. Tifdwarf bermudagrass clipping weights 14 DAT were reduced for metsulfuron (average 34%), imazaquin (average 48%), and 2,4-D plus dicamba (average 61%). Clipping weights soon recovered and were unaffected following all treatments by 28 DAT."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCarty, L. B. 1991. Metsulfuron for prostrate spurge control in bermudagrass. South. Weed Sci. Soc. Proc. 44:p. 180.
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