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Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Tucker, B. J.;
Higingbottom, J. K.;
McCarty, L. B. |
Author Affiliation: | Clemson University, Department of Horticulture, Clemson, South Carolina |
Title: | Tolerance to fluroxypyr and clopyralid in bermudagrass (Cynodon dactylon) and St. Augustinegrass (Stenotaphrum secondatum) |
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.: | 55th Annual Meeting, Atlanta, GA: January 28-30, 2002 |
Source: | Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 67-68. |
Publishing Information: | Champaign, IL: Southern Weed Science Society. |
# of Pages: | 2 |
Abstract/Contents: | "St. Augustinegrass (Stenotaphrum secondatum) is a popular turf for home lawns in the southeastern United States, and for shaded areas on golf courses. St. Augustinegrass is a turf of course texture and medium density. Bermudagrass (Cynodon dactylon) is a medium texture, high-density, dark green turfgrass. Common bermudagrass is a popular turf for home lawns and low management athletic fields in warm-season areas. The hybrid bermudarass `Tifway' has become the standard for golf course fairways and sports fields in warm-season areas. The objective of this study was to determine tolerance of these grasses to fluroxypyr and clopyralid. A study was performed in spring 2001 on common bermudagrass on a local golf course driving range. Treatments included single applications of Fluroxypyr 1.5 EC and Lontrel T&O (clopyralid) 3 SL at 0.09lbs ai/A and 0.12 lbs ai/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.17lbs AE/A and 0.24 lbs AE/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.36 lbs ai/A and 0.49 lbs ai/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.72 lbs ai/A and 0.99 lbs ai/A. Single applications of Trimec Southern (2,4 D + Dicamba + MCPP) 4.58 SL at 1.19 lbs ai/A. Initial applications for this study were made on May 16, 2001. Visual turf injury was rated on a 0-100% scale with a 30% maximum level of acceptable injury. Three studies were performed in the summer of 2001 on Clemson University research plots. Two varieties of St. Augustinegrass (`Raleigh' and `Palmetto'), and `Tifway' bermudagrass received similar treatments. Treatments included single applications of Fluroxypyr 1.5 EC and Lontrel T&O (clopyralid) 3 SL at 0.09 lbs ai/A and 0.12 lbs ai/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.17 lbs ai/A and 0.24 lbs ai/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.36 lbs ai/A and 0.49 lbs ai/A. Single applications of Fluroxypyr 1.5 EC and Lontrel T&O 3 SL at 0.72 lbs ai/A and 0.99 lbs ai/A. Single applications of Trimec Southern (2,4 D + Dicamba + MCPP) 4.58 SL at 1.19 lbs ai/A. Single applications of Confront (clopyralid + triclopyr) 3 EC at 0.75 lbs ai/A. Single applications of Bo Fix (fluroxypyr + clopyralid + MCPA) 2.3 L at 0.86 lbs ai/A. Initial applications for all three studies were made on July 26, 2001. Visual turf injury was rated on a 0-100% scale with 30% maximum level of acceptable injury. The common bermudagrass exhibited excellent tolerance (<10% injury) to all herbicides in this study. the `Raleigh' and `Palmetto' St. Augustine displayed tolerance (<30% injury) to all herbicides in this study. Confront caused the most injury to `Raleigh', with 23.3% injured observed on August 13, 2001. `Palmetto' was also least tolerant to Confront, with 26.7% injured observed on August 13, 2001. `Tifway' showed poor (>30% injury) tolerance to Fluroxypyr and Lontrel T&O at 0.72 lbs ai/A and 0.99 lbs ai/A. `Tifway' also showed poor tolerance (>35% injury) to Confront at 0.75 lbs ai/A, and was least tolerant (>50% injury) to Bo Fix at 0.38 lbs ai/A. In conclusion, common bermudagrass exhibited excellent tolerance to all herbicides in this study Confront caused the most injury in both varieties of St. Augustinegrass, but both `Palmetto' and `Raleigh' displayed acceptable tolerance to all herbicides in this study. However, `Tifway' had poor tolerance to higher levels of fluroxypyr and clopyralid. The herbicides Confront and Bo Fix caused the most injury in `Tifway' Bermudagrass." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Tucker, B. J., J. K. Higingbottom, and L. B. McCarty. 2002. Tolerance to fluroxypyr and clopyralid in bermudagrass (Cynodon dactylon) and St. Augustinegrass (Stenotaphrum secondatum). South. Weed Sci. Soc. Proc. 55:p. 67-68. |
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