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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cox, C. J.;
McCarty, L. B.;
Higingbottom, J. K. |
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| Author Affiliation: | Department of Horticulture, Clemson University, Clemson, SC |
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| Title: | Envoy (clethodim) for bermudagrass control and centipedegrass tolerance |
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| Section: | Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
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| Meeting Info.: | 52nd Annual Meeting, Greensboro, NC, January 25-27, 1999 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 68. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Clethodim; Bermudagrass control; Eremochloa ophiuroides; Herbicide resistance; Application rates; Herbicide injury; Weed control; Tank mix; Sethoxydim; Surfactants; Thiram; Adjuvants; Costs; Herbicide evaluation
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| Abstract/Contents: | "Common bermudagrass is the most serious weed for Southern U.S. sod producers. A study was conducted to evaluate the effectiveness of Envoy 0.94EC (clethodim) for bermudagrass control and centipedegrass tolerance. The investigation occurred on a commercial sod operation in Neeses, South Carolina. Eight separate treatments were applied to 10 x 10 ft strips of centipedegrass naturally infested with bermudagrass. Four replications of each treatment were rated on the basis of visual bermudagrass control (%) and centipedegrass injury (%). An arbitrary value of 30% was used for maximum commercially acceptable centipedegrass injury. Plots were rated bi-weekly beginning two weeks after the initial application. Treatments with Vantage (sethoxydim) alone, Envoy (with Dash surfactant), Envoy (with Optima surfactant), were applied to the randomized plots at different rates and application times. Treatments were applied using a CO₂ backpack sprayer calibrated at 20 gal/ac and fitted with 8003 flat fan tips. Two applications were made, the first on June 10, 1998, the second on July 10, 1998. Two weeks after the initial treatments, there was minimal turf injury (<8%) with best bermudagrass control (70%) for Envoy at 68.0 oz/ac. Vantage at 2.25 pt/ac controlled approximately 15% of the bermudagrass with <5% injury to the centipedegrass. Envoy had no injury to centipedegrass at either 17.0 oz/ac rate or at 34.0 oz/ac plus Optima surfactant. Minor injury (<8%) was observed for all other applications of Envoy. Bermudagrass control was significantly higher at this time using Envoy with either surfactant as compared to the industry standard Vantage. At four weeks after the first application (July 10), no visible injury to the centipedegrass existed for any treatment. Vantage provided 35% control, 17.0 oz/ac Envoy with Optima or Dash provided 40-50% control, 34.0 oz/ac Envoy + Optima 43% control, 34.0 oz/ac Envoy + Dash 85% control, 68.0 oz/ac Envoy + Optima 59% control, and 68.0 oz/ac Envoy + Dash 74% control. At six weeks after initial application, each treatment averaged 25% increase in bermudagrass control while centipedegrass injury remained low (<13%). Best treatment was 34.0 oz/ac of Envoy + Dash, with >90% control of bermuda and <5% injury to centipede. Envoy + Dash at 68 oz/ac had 90% control and 13% turf injury. Vantage provided 76% control and <2% injury at this time. By eight weeks after initial application, centipedegrass injury was minimal for all treatments. Bermudagrass control at this time for 17 oz/ac Envoy + Optima was at 44% control. Vantage, 17 oz/ac Envoy + Dash, and 34 oz/ac Envoy + Optima was at 80-90% control; 34 oz/ac Envoy + Dash, 68 oz/ac Envoy + Optima, and 68 oz/ac Envoy + Dash was at >95% control. In conclusion, Envoy treatments using two different adjuvants, were effective for bermudagrass control and centipedegrass tolerance. Overall best treatments were two applications of Envoy (with Dash surfactant) at rates of 34.0 oz/ac or 68 oz/ac each. Although the 68 oz/ac rate did experience minor centipede grass injury, the turf recovered within 4 weeks. Envoy proved to be slightly more effective than Vantage at 2.25 pt/ac, which had previously been the industry standard for bermudagrass control. Future experimentation includes a cost analysis for the most effective and economical application rates of Envoy, and best Envoy + Adjuvant ratio to obtain best bermudagrass control with least centipedegrass injury." |
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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):
Cox, C. J., L. B. McCarty, and J. K. Higingbottom. 1999. Envoy (clethodim) for bermudagrass control and centipedegrass tolerance. South. Weed Sci. Soc. Proc. 52:p. 68. |
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MSU catalog number: SB 611 .S6 v.52 |
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