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| Web URL(s): | http://www.swss.ws/wp-content/uploads/2021_SWSS_Proceedings_Final.pdf#page=100
Last checked: 06/24/2022
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary Only |
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| Author(s): | Peppers, J. M.;
Askew, S.;
Brewer, J. |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Goosegrass (Eleusine indica) control and warm-season turfgrass tolerance to combinations of topramezone and SpeedzoneĀ® EW herbicide |
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| Section: | 2021 Meeting abstract
Other records with the "2021 Meeting abstract" Section
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| Meeting Info.: | January 25-26, 2021 |
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| Source: | Proceedings of the Southern Weed Science Society 74th Annual Meeting. Vol. 74, 2021, p. 1. |
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| Publishing Information: | Biloxi, MS: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Topramezone effectively controls goosegrass (Eleusine indica L. Gaertn.), but warm-season turfgrass suffers severe bleaching injury when topramezone is applied even at low rates. Admixtures with topramezone to mitigate warm-season turfgrass injury have drawn research attention recently due to the limited options for postemergence goosegrass control. It is hypothesized that Speedzone EW (2,4-D, MCPP, dicamba, and carfentrazone) can reduce topramezone-associated bleaching in warm-season turfgrass while maintaining goosegrass control. Three field studies were conducted in the summer of 2020 in Blacksburg, VA to evaluate goosegrass control and 'Latitude 36' bermudagrass (Cynodon dactylon L.) and 'Zeon' zoysiagrass (Zoysia matrella L.) tolerance to combinations of topramezone and Speedzone EW. These studies consisted of eight treatments and a nontreated control. These treatments include Speedzone EW (1010 g ha-1 ) alone applied twice, topramezone (12.3 g ai ha-1 ) alone applied with MSO (0.5% v/v) and topramezone applied at 6.15 and 12.3 g ai ha-1 plus Speedzone EW applied at 505, 758, and 1010 g ai ha-1 . Each week, goosegrass control and bleaching as well as turfgrass injury and bleaching were visually evaluated on a 0-100% scale. Topramezone (12.3 g ai ha-1 ) alone controlled goosegrass 91% at 4 weeks after treatment (WAT) while Speedzone EW controlled goosegrass not more than 34% at 8 weeks after the initial treatment (WAIT) following two treatments. Every combination of topramezone and Speedzone EW controlled goosegrass between 84-89% at 4 WAT with the exception of topramezone (12.3 g ai ha-1 ) plus Speedzone EW (1010 g ai ha-1 ) which controlled goosegrass 97%. The addition of Speedzone EW to topramezone reduced the foliar bleaching on goosegrass to no more than 8%. Topramezone (12.3 g ai ha-1 ) applied alone was the most injurious treatment to bermudagrass. The addition of Speedzone EW to topramezone reduced foliar bleaching at all Speedzone EW rates. Speedzone EW alone was injurious to bermudagrass and while the addition of Speedzone EW to topramezone reduced the bleaching injury, general bermudagrass necrosis was also observed with these treatments. The duration of injury when topramezone was applied alone and in combination with Speedzone EW was similar, with the exception of the lower rate of topramezone (6.15 g ai ha-1 ) plus the lowest rate of Speedzone EW (505 g ai ha-1 ). This treatment recovered more quickly than the other treatments and was also less injurious. Topramezone (12.3 g ai ha-1 ) alone injured bermudagrass more than any other treatment in this study. While foliar bleaching decreased as Speedzone EW rate increased, bermudagrass injury also increased as Speedzone EW rates increased. Speedzone EW injured zoysiagrass less than it injured bermudagrass. Overall trends in zoysiagrass response to the addition of Speedzone EW to topramezone were similar to bermudagrass response, but the maximum injury, injury duration, and foliar bleaching were lower on zoysiagrass compared to bermudagrass when Speedzone EW was included in the treatment. The addition of Speedzone EW to topramezone reduced foliar bleaching from 65% to <10%. From these studies, we can conclude that the addition of Speedzone EW to topramezone can significantly reduce foliar bleaching of goosegrass and warm-season turf species while also maintaining goosegrass control. Speedzone EW is more injurious to bermudagrass than zoysiagrass and combinations of Speedzone EW and topramezone were less injurious to zoysiagrass than bermudagrass." |
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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):
Peppers, J. M., S. Askew, and J. Brewer. 2021. Goosegrass (Eleusine indica) control and warm-season turfgrass tolerance to combinations of topramezone and SpeedzoneĀ® EW herbicide. South. Weed Sci. Soc. Proc. 74:p. 1. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/2021_SWSS_Proceedings_Final.pdf#page=100
Last checked: 06/24/2022
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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