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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=195
Last checked: 08/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Elmore, M. T.;
Brosnan, J. T.;
Breeden, G. K. |
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| Author Affiliation: | University of Tennessee, Knoxville, TN |
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| Title: | Using growing degree day application timings to maximize efficacy of fluazifop and triclopyr for control of bermudagrass (Cynodon spp.) in zoysiagrass |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Little Rock, Arkansas: January 25-27, 2010 |
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| Source: | 2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 145. |
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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 timing; Cynodon dactylon; Fluazifop; Fluazifop-butyl; Herbicide combinations; Herbicide evaluation; Triclopyr; Weed control; Zoysia japonica
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| Abstract/Contents: | "Common bermudagrass (Cynodon dactylon) commonly invades zoysiagrass throughout the southern United States. Research was conducted in 2009 at the East Tennessee Research and Education Center to evaluate mixtures of fluazifop-p-butyl (fluazifop) and triclopyr applied at multiple timings for selective postemergence bermudagrass control in zoysiagrass (Zoysia japonica) turf. Plots measuring 1 x 1 meters were arranged in a 4 x 5 factorial design replicated three times. Herbicide treatment and application timing served as factors in this study. The 4 herbicide treatments evaluated were single applications of fluazifop + triclopyr applied at rates of 0.10 + 1.13 kg ai/ha, 0.21 + 1.13 kg ai/ha, 0.32 + 1.13 kg ai/ha, respectively and an untreated check. All treatments were applied with a CO2 powered boom sprayer calibrated to deliver 280 L/ha. The sprayer boom contained four, flat-fan nozzles spaced 25 cm apart. A wheeled aluminum frame maintained the boom height 25 cm above the surface while spraying at 124 kPa. These treatments were applied at 5 timings: 200 growing degree days (GDD10C), 450 GDD10C, 825 GDD10C, 1275 GDD10C, and 1775 GDD10C. Yearly accumulated GDD10C were calculated beginning January 1st using a Celsius scale according to the equation, GDD10C = [(Tmax- Tmin)/2] - Tbase where Tmax represents the daily maximum air temperature, Tmin represents the daily minimum air temperature, and Tbase equals 10°C. Bermudagrass control and zoysiagrass injury were assessed weekly from 1 WAT (weeks after treatment) to 9 WAT using a visual scale from 0 (no control or injury) to 100% (complete control). Bermudagrass and zoysiagrass injury were also assessed by relative chlorophyll index (R840nm/R700nm) with a hand-held chlorophyll meter. Data were subjected to ANOVA in SAS. Fisher's protected LSD values were used to separate means significant at the α=0.05 level. Treatments of fluazifop + triclopyr applied at 1775 GDD10C provided greater bermudagrass control than all other treatments 7,8 and 9 WAT. Control following fluazifop + triclopyr applied at 200 GDD10C was greater 6 and 7 WAT than treatments applied at 450 GDD10C, 825 GDD10C and 1275 GDD10C. All treatments except the 450 GDD10C application of fluazifop + triclopyr at 0.32 + 1.13 kg, respectively, provided greater than 60% bermudagrass control 2 WAT. By 9 WAT control was below 15% for all treatments except those applied at 1775 GDD10C for which control was greater than 80%. Zoysiagrass injury was less than 10% for all treatments applied at 1775 GDD10C at all ratings dates. Zoysiagrass injury 7 DAT for all treatments applied at 200 GDD10C ranged from 10-20%. No zoysiagrass injury was detected for any treatment 5-9 WAT." |
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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):
Elmore, M. T., J. T. Brosnan, and G. K. Breeden. 2010. Using growing degree day application timings to maximize efficacy of fluazifop and triclopyr for control of bermudagrass (Cynodon spp.) in zoysiagrass. South. Weed Sci. Soc. Proc. 63:p. 145. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=195
Last checked: 08/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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