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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=88
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Lewis, D. F.;
McElroy, J. S.;
Sorochan, J. C.;
Breeden, G. K. |
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| Author Affiliation: | Department of Plant Science, University of Tennessee, Knoxville |
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| Title: | Response of zoysiagrass to varied rates and timings of fluazifop and triclopyr |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Jacksonville, Florida: January 27-30, 2008 |
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| Source: | 2008 Proceedings, Southern Weed Science Society. Vol. 61, 2008, p. 153. |
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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: Application rates; Application timing; Bermudagrass control; Fluazifop; Herbicide efficacy; Herbicide evaluation; Triclopyr; Zoysia
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| Abstract/Contents: | "One of the most problematic weeds to control when managing zoysiagrass (Zoysia spp.) fairways is bermudagrass (Cynodon dactylon). Controlling bermudagrass in zoysiagrass turf is difficult due to its rapid growth habit and few available selective herbicides. Glyphosate applications are normally unsuccessful due to bermudagrass's ability to regrow from deep, underground rhizomes and out-compete the slower establishing zoysiagrass. Aryloxyphenoxypropionate (AOPP) herbicides have been applied post-emergence for the selective control of annual and perennial grass weeds. Previous research indicates that tank-mixing the AOPP herbicide fluazifop with triclopyr increased bermudagrass suppression and decreased zoysiagrass injury. Additional research to determine the optimal rate and timing of fluazifop tank-mixed with triclopyr could lead to improved selective herbicide programs for bermudagrass control in zoysiagrass turf. Research was conducted in 2007 at the University of Tennessee East Tennessee Research and Education Center (ETREC)-Plant Science Unit in Knoxville, TN. Treatments included are: fluazifop (0.11, 0.16, 0.21, and 0.26 kg ai/ha) alone or tank-mixed with triclopyr (1.12 kg ai/ha) at two or four week intervals. Treatments were made to 'Compadre' zoysiagrass (Zoysia japonica) beginning June 11, 2007. Sequential applications were made every 7 or 14 days (depending on treatment) for a total of four applications of each treatment. Turfgrass injury was visually rated every two weeks utilizing a 0-100% scale (0%=no visible turfgrass injury; 100%=complete turfgrass death). Digital images were taken every two weeks for each plot utilizing a 0.28 m2 light box equipped with a Canon G5 digital camera. Images were analyzed for percent cover, hue, saturation, and brightness according to published methods. Due to space limitations we will only present cover reduction data from 8 weeks after trial initiation. This trial was replicated four times in a randomized complete block design. Experimental units measured 1.5m x 3m2. Herbicide applications were applied with a CO2 pressurized sprayer calibrated at 280 L/ha. At two week intervals, all rates of fluazifop alone reduced zoysiagrass cover unacceptably (55-97%). When tank-mixed with triclopyr, percent cover reduction was reduced when compared to fluazifop alone, but percent cover reduction was unacceptable (28-69%). At four week intervals, fluazifop alone at 0.11 and 0.16 kg ai/ha caused minimal cover reduction (<20%), but increased fluazifop rates led to increased reduction (>30%). When tank-mixed with triclopyr, all rates fluazifop rates were safe to apply on zoysiagrass (<12%) at four week intervals. According to contrast, increasing fluazifop rates amplified zoysiagrass cover reduction linearly when treated with fluazifop alone and fluazifop plus triclopyr at two week intervals and fluazifop alone at four week intervals. No differences were observed between increasing rates of fluazifop plus triclopyr applied at four week intervals. These data indicate that triclopyr safens fluazifop when applied at two and four week intervals. However, due to unacceptable injury at two week intervals, four week intervals of fluazifop tank-mixed with triclopyr are the safest strategy for controlling bermudagrass in zoysiagrass turf." |
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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):
Lewis, D. F., J. S. McElroy, J. C. Sorochan, and G. K. Breeden. 2008. Response of zoysiagrass to varied rates and timings of fluazifop and triclopyr. South. Weed Sci. Soc. Proc. 61:p. 153. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=88
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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