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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | McCarty, L. B. |
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| Author Affiliation: | Department of Environmental Horticulture, University of Florida, Gainesville, FL |
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| Title: | Quinclorac evaluations in warm-season turfgrasses |
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| Meeting Info.: | Little Rock, AR; January 21-22, 1992 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 45, January 1992, p. 136. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Quinclorac; Warm season turfgrasses; Metsulfuron; Cynodon
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| Abstract/Contents: | "This report summmarizes quinclorac evaluations in Florida during 1990-1991. Studies included: postemergence broadleaf control in bermudagrass (Cynodon spp.); blanket crabgrass (Digitaria serotina DIGSE) control in St. Augustinegrass (Stenotaphrum secundatum STESE); and torpedograss (Panicum repens PANRE) suppression in bermudagrass. Plot size was 3.3 * 3.3 m. A RCB design was used with 4 replicates per study. Sprayable herbicides were applied in 187 L/ha of water. Percent weed control was estimated visually. Turf quality and density were rated visually on a scale of 1-9 with 9=best and 6.5=acceptable. An average 40% lawn burweed (Soliva pterosperma SOLPT) control was achieved 4 weeks after an April treatment with 0.56 to 1.12 kg/ha. In comparison, metsulfuron (0.02 kg/ha) and a combination of 2, 4-D + dicamba and MCPP (1.12 kg/ha) provided 95% control. Subsequential quinclorac treatments of 0.56 and 0.84 kg/ha each 4 weeks after the initial had 45% SOLPT control. Single quinclorac applications of 0.56 and 0.84 kg/ha provided an average 51% control of redweed (Melochia corchorifolia MELCO) and 44% control of common purslane (Portulaca oleracea POROL) four weeks after treatment (WAT). Greater than 95% weed control was provided at this time by metsulfuron (0.02 kg/ha), a combination of 2, 4-D + dicamba + MCPP (1.8 kg/ha), and the experimental compounds BAS044 (0.84 kg/ha) and 018847 (1.8 kg/ha). In the crabgrass study, single 0.56 to 1.12 kg/ha quinclorac applications provided >95% DIGSE control 4 weeks after application while single applications of MSMA (2.24 kg/ha) provided <20% control. Sequential quinclorac treatments 6 weeks after the initial provided excellent (100%) DIGSE control while subsequential MSMA application provided <20% control. In the torpedograss study, single 1.12 kg/ha treatments averaged over 3 tests had 72% suppression 3 WAT. PANRE suppression droppped to 39% 6 WAT and to 19% 8 WAT. Two applications each at 1.12 kg/ha spaced 3 weeks apart, provided an average 65% and 36% PANRE suppression 3 and 6 weeks after the second treatment, respectively. Three sequential treatments of quinclorac at 1.12 kg/ha each spaced 3 weeks apart provided 70% PANRE suppression 2 weeks after the last application. Two 2.24 kg/ha quinclorac applications split 3 weeks apart provided 90, 80 and 59% PANRE suppression 3, 5, and 9 weeks after the second treatment, respectively. In comparison, a single 4.48 kg/ha application provided 91% suppression 3 and 6 WAT, 76% suppression 8 WAT, and 59% suppression 12 WAT. Best suppression was provided by an initial 2.24 kg/ha quinclorac with two sequential 1.12 kg/ha treatments spaced 3 weeks apart. A total of 4.48 kg/ha quinclorac with this sequence provided 90% suppression 2 weeks after the last treatment and 74% suppression 6 weeks after the last treatment. The addition of imazaquin (0.56 kg/ha) or MSMA (1.12 kg/ha) did not influence PANRE suppression with quinclorac. Turfgrass tolerance to quinclorac was good to excellent by Tifway bermudagrass with only short-term topical phytotoxicity at the high 4.48 kg/ha rate. Centipedegrass tolerance was acceptable with single applications up to 0.84 kg/ha while St. Augustinegrass had unacceptable tolerance to quinclorac at all rates studied." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCarty, L. B. 1992. Quinclorac evaluations in warm-season turfgrasses. South. Weed Sci. Soc. Proc. 45:p. 136. |
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MSU catalog number: SB 611 .S6 |
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