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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=345
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Leon, R. G.;
Brecke, B. J.;
Unruh, J.;
Kenworthy, K. E. |
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| Author Affiliation: | Leon, Brecke and Unruh: University of Florida, Jay; Kenworthy: University of Florida, Gainesville, FL |
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| Title: | Differential response to fluazifop-P-butyl in zoysiagrass cultivars |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Houston, Texas: January 28-30, 2013 |
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| Source: | Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 258. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Comparisons; Cultivar variation; Fluazifop-P-butyl; Herbicide evaluation; Herbicide injury; Weed control; Zoysia
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| Abstract/Contents: | "Control of grass weed species in turfgrasses is a challenge due to the limited number of herbicides that will kill the weeds without seriously injuring the turfgrass. Fluazifop-P-butyl is a grass herbicide that can provide effective control of multiple grass weeds, and at label rates should only cause transient phytotoxicity to zoysiagrass. For this reason, fluazifop-P-butyl is an option for controlling contaminant grass species such as common and hybrid bermudagrass in zoysiagrass. However, zoysiagrass has a high genetic diversity, so it is not clear whether different commercial cultivars have the same level of tolerance to this herbicide, or if the current label rates are appropriate for all of them. Greenhouse and field experiments were conducted to determine the level of zoysiagrass cultivar tolerance to fluazifop-P-butyl. The greenhouse experiments indicated that 5 of the 12 cultivars evaluated differed in visual injury or biomass production after one application of fluazifop-P-butyl at 1.25 oz ai/A. 'JaMur' and 'Geo' were the most tolerant cultivars exhibiting approximately half the injury (16%) compared with the other cultivars (34%) 21 DAT. Dose response experiments were conducted in the field to better describe tolerance responses using 0, 0.62, 1.25, 1.88, 2.50 and 3.75 oz ai/A, which were equivalent to 0X, 0.5X, 1X, 1.5X 2X and 3X the highest label rate, respectively. 'Pristine' and 'Zeon' showed the highest injury, which was 50-86% when rates were >= 1.25 oz/A. 'Empire', 'Geo', 'Meyer' and 'JaMur' showed higher levels of tolerance with half or less injury levels than 'Pristine' and 'Zeon'. 'Emerald', 'Palisades', 'Royal', 'Crown' and 'Ultimate' showed intermediate tolerance. All zoysiagrass cultivars recovered with no visual injury 60 DAT. Common bermudagrass was controlled >95% with most rates except 0.62 oz/A, which provided only 73% control 30 DAT. The results indicated that the highest label rate of fluazifop-P-butyl at 1.25 oz/A can provide control of common bermudagrass without causing significant phytotoxicity to most zoysiagrass cultivars. 'Pristine' and 'Zeon' should not be treated with rates higher than 0.75 oz/A, but the other evaluated cultivars appear to tolerate up to 1.88 oz/A of fluazifop-P-butyl without causing injury that is significantly higher than the injury at 1.25 oz/A. This higher application rate might be more viable for sod growers because 6 to 8 weeks will be required for the turfgrass to fully recover after treatment. Additionally, eighty new zoysiagrass genotypes were screened for fluazifop-P-butyl tolerance, and 10 genotypes showed <5% visual injury after an application with 1.25 oz/A, suggesting that there is potential to develop new zoysiagrass cultivars with significantly higher tolerance compared with current commercial cultivars." |
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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):
Leon, R. G., B. J. Brecke, J. Unruh, and K. E. Kenworthy. 2013. Differential response to fluazifop-P-butyl in zoysiagrass cultivars. South. Weed Sci. Soc. Proc. 66:p. 258. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=345
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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