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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Willard, T. R.;
Currey, W. L. |
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| Author Affiliation: | Dept. of Agronomy, University of Florida, Gainesville, FL. |
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| Title: | Selectivity of Postemergence Grass Herbicides in Warm-Season Turfgrasses |
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| Meeting Info.: | Held: January 14-16, 1985, Houston, TX. |
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| Source: | Proceedings of the 38th Southern Weed Science Society. Vol. 38, 1985, p. 96. |
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| Publishing Information: | Southern Weed Science Society |
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| Keywords: | TIC Keywords: Selectivity; Postemergence herbicides; Warm season turfgrasses; Paspalum notatum; Eremochloa ophiuroides; Stenotaphrum secundatum; Digitaria ciliaris; Digitaria sanguinalis; Sethoxydim; Fluazifop-butyl; Cloproxydim; Haloxyfop-methyl; Quizalofop; Weed control; Carbon dioxide exchange rate; Herbicide rates; Herbicide selectivity
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| Abstract/Contents: | "Selective annual grassy weed control in bahiagrass (Paspalum notatum Flugge.) and centipedegrass [Eremochloa ophiuroides (Munro.) Hack.] is difficult to achieve. Variability in time of weed emergence limits the effectiveness of preemergence herbicide applications in Florida and there are no postemergence grass herbicides registered for these two turfgrasses. Seven selective postemergence grass herbicides, sethoxydim, fluazifop-butyl, cloproxydim, haloxyfop-methyl, HOE A25-01 (ethyl 2-[4-[(6-chloro-2-benz-oxazoyl) oxy] phenoxy] propanoate), DPX-Y6202 (2-[4-[(6-chloro-2-quinoxalinyl) oxy]-phenoxy]-propoinic acid), and CGA-82725 (2-[4-(3,5-dichloro-2-pyridinyl) oxy] phenoxy] propanoate, were applied to field plots of Pensacola bahiagrass, common centipedegrass, and Floratam St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] in 1982 and/or 1983. Turf phytotoxicity ratings on a 0 to 10 scale were taken periodically following application. In 1983 control of [Digitaria ciliaris (Retz.) Koel.] was also evaluated. To determine the effect of postemergence grass herbicides on turfgrass carbon exchange rate (CER) a laboratory study was conducted using common centipedegrass established in 15 cm pots. A closed chamber system using infra-red analysis of canopy CO2 content was used. Sethoxydim, cloproxydim, and fluazifop-butyl were applied at 0.25, 0.56, and 0.25 kg/ha a.i., respectively. CER measurements were taken daily for 12 days following applications. Clipping dry weights were attained following measurements on day 12. Excellent crabgrass control was observed following the application of the highest rate of each herbicide. Sethoxydim was the only herbicide studied that demonstrated an acceptable degree of selectivity in Pensacola bahiagrass. Rates of 0.14 and 0.28 kg/ha a.i. provided annual grassy weed control with limited unaccaptable injury. None of the postemergence grass herbicides studied were superior to asulam at 2.2 or 4.5 kg/ha a.i. Sethoxydim and cloproxydim were very selective in common centipedegrass at rates up to 0.83 and 90.56 kg/ha a.i., respectively. Significant reductions in centipedegrass CER were not measured until substantial injury was visible. At 12 days after application sethoxydim, cloproxydim, and fluazifop-butyl reduced CER 27, 32, and 58% respectively. However, the clipping dryweight was only significantly reduced in centipedegrass treated with fluazifop-butyl." |
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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):
Willard, T. R., and W. L. Currey. 1985. Selectivity of Postemergence Grass Herbicides in Warm-Season Turfgrasses. Proc. Meet. South. Weed Sci. Soc. 38:p. 96. |
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