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Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=188 Last checked: 07/15/2013 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Author(s): | Waltz, F. C. Jr.;
Murphy, T. R.;
Brecke, B. J.;
Lickfeldt, D. W. |
Author Affiliation: | Waltz and Murphy: University of Georgia, Griffin, GA; Brecke: University of Florida, Milton; Lickfeldt: Dow AgroSciences, Indianapolis, IN |
Title: | Efficacy of fluroxypyr in warm-season turfgrasses |
Section: | Weed management in turf, pasture, and rangeland Other records with the "Weed management in turf, pasture, and rangeland" Section
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Meeting Info.: | Houston, Texas: January 27-29, 2003 |
Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 102-103. |
Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
# of Pages: | 2 |
Keywords: | TIC Keywords: Fluroxypyr; Herbicide efficacy; Herbicide evaluation; Warm season turfgrasses
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Abstract/Contents: | "To control a wide spectrum of broadleaf weeds in warm-season turfgrasses a herbicide mixture is typically used. A formulated mixture of ten includes a herbicide from the phenoxy family. Turfgrass tolerance to this class of herbicides varies between species, with some grasses like bermudagrass (Cynodon sp.) being relatively tolerant at labeled rates, while sever injury can occur to St. Augustinegrass (Stenotaphrum secundatum ). Replacement of the phenoxy herbicide in these mixtures with a material that is efficacious at lower amounts and non-injurious to a broad spectrum of turfgrasses is desirable. Fluroxypyr is a broadleaf auxin-type herbicide in the pyridinyloxyacetic acid family with little soil activity. The objectives of these studies were to determine the efficacy of fluroxypyr on broadleaf weeds and determine the turf tolerance of warm-season turfgrasses to various tank mix combinations. This work is a summary of twelve trials conducted in Florida and Georgia over the 2001 and 2002 growing seasons. These studies included seven turfgrass cultivars, common bermudagrass, 'Tifway' and 'TifSport' bermudagrasses (C. dactylon X C. transvaalensis ), 'Raleigh' and 'Palmetto' St. Augustinegrasses, 'Meyer' zoysiagrass (Zoysia japonica ), and centipedegrass (Eremochloa ophiuroides ). Plots were in a randomized complete block design with three replications. Using a CO2 backpack sprayer set to deliver 20 gpa, postemergence applications were applied as a single application during the growing season. Treatments included fluroxypyr (0.28 kg ai ha-1 ), clopyralid (0.28 kg ai ha-1 ), fluroxypyr + clopyralid (0.07 + 0.07, 0.13 + 0.13, and 0.28 + 0.28 kg ai ha-1 ), MCPP + fluroxypyr (3.5 l ha-1 ), MCPP + clopyralid (3.2 l ha-1), and 2,4-D + MCPP + dicamba (2.3 l ha-1 ). An untreated control was included in all studies. The broadleaf weeds evaluated in these studies were white clover (Trifolium repens ), buckhorn plantain (Plantago lanceolata ), Virginia buttonweed (Diodia virginiana ), and Dollarweed (Hydrocotyle sp.). Visual control ratings were made on a 0% to 100% scale, 0%= no control, and 100%= complete control, 70% control was considered minimally acceptable. Also, turfgrass injury was rated on a 0% to 100% scale, 0%= no visible injury or discoloration and 100%= brown dead turfgrass, 30% was considered the maximum allowable injury. For plots treated with clopyralid, fluroxypyr + clopyralid (0.25 + 0.25 kg ai ha-1 ), MCPP + fluroxypyr, and MCPP + clopyralid, acceptable contro l (> 70%) of white clover was observed 2 weeks after application (WAA). All treatments ha d greater than 90% control of white clover and buckhorn plantain at 3 WAA. Acceptable control of Virginia buttonweed was noted 3 WAA for plots treated with fluroxypyr + clopyr alid (0.13 + 0.13 and 0.28 + 0.28 kg ai ha-1 ), and 2,4-D + MCPP + dicamba. Additionally, greater than 90% control was observed with these treatments 9 WAA. Dollarweed control was greater than 90% at 1 and 14 WAA when the phenoxy herbicide MCPP was added to fluroxypyr and clopyralid. In all evaluations, no injury was observed in treatments containing fluroxypyr for common bermudagrass and 'Meyer' zoysiagrass. Centipedegrass injury did not exceed 10% and fully recovered by 4 WAA. In one of the studies , turfgrass injury was observed on 'Tifway' bermudagrass while no injury was observed on a separate study evaluating this cultivar. Observable injury never exceeded 30% and the turfgrass recovered by 3 WAA. 'TifSport' bermudagrass had similar results, but minimal injury (< 10%) was noted at 6 WAA. In one study on St. Augustinegrass, unacceptable (> 30%) injury was observed at 2 and 4 WAA for treatments containing 2,4-D or MCPP. Treatments including fluroxypyr, clopyralid, and fluroxypyr + clopyralid, did injure St. Augustinegrass, although injury did not exceed 30% and was less than 10% by 6 WAA. A spectrum of broadleaf weeds ranging from easily controlled white clover and buckhorn plantain to more difficult species like Virginia buttonweed was controlled with fluroxypyr. However, inconsistent tolerance of hybrid bermudagrasses and St. Augustinegrass merits further study. Multiple applications at lower rates may be as effective at controlling these weed species and minimize turfgrass injury." |
Language: | English |
References: | 0 |
Note: | "Invasive weeds: Real or imagined threat?" This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Waltz, F. C. Jr., T. R. Murphy, B. J. Brecke, and D. W. Lickfeldt. 2003. Efficacy of fluroxypyr in warm-season turfgrasses. South. Weed Sci. Soc. Proc. 56:p. 102-103. |
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| Web URL(s): http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=188 Last checked: 07/15/2013 Requires: PDF Reader Notes: Item is within a single large file |
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