Full TGIF Record # 42204
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Prinster, M. G.; Russell, T. A.
Author Affiliation:TruGreen/ChemLawn Technical Center-South, Douglasville, GA 30134
Title:Common and hybrid bermudagrass (Cynodon spp. ) control in tall fescue with various herbicides and application strategies
Meeting Info.:50th Annual Meeting, Houston, TX, January 20-22, 1997
Source:Southern Weed Science Society Proceedings. Vol. 50, January 1997, p. 71.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Abstract/Contents:"Tall fescue is a highly desirable lawngrass through much of the transition zone. Throughout this same gegraphical region common and hybrid bermudagrass are also grown and can be found as contaminants in tall fescue lawns. Differences in texture and growth habit make this turfgrass mix undesirable. Traditional methods of bermudagrass control would include complete lawn renovation with non-selective herbicides. However, even with the best control methods several herbicide applications over several months would be required to eliminate a highly persistent weed such as bermudagrass. Recently, several herbicides have shown potential to selectively control bermudagrass in cool season turfs after repeated applications. A strategy such as this would be of great value to turf managers in the transition zone. To further develop selective bermudagrass control programs, a series of 8 studies was conducted in 1994 and 1995 on both common and hybrid bermudagrass. One objective of these studies was to determine whether spray applications initiated in the fall, as bermuda was preparing for dormancy, would provide greater efficacy than programs initiated in the spring after greenup. The effectiveness of four and six week application intervals was also monitored. On August 22, 1994 four inch plugs of common and 'Tifway' (Tifton 419) bermudagrass were transplanted into an established stand of Rebel II/Tribute turf-type tall fescue. Spray programs were initiated beginning on Sept. 30, 1994 and repeated until bermudagrass went dormant. Other programs were delayed until the following spring on April 26, 1995 after greenup. Herbicide programs included repeat applications of fenoxaprop 0.35 lb ai/A, fenoxaprop 0.35 lb ai/A + ethofumesate 2.0 lb ai/A, fenoxaprop 0.18 lb ai/A + triclopyr 1.0 lb ai/A, ethofumesate 1.5 lb ai/A + triclopyr 1.0 lb ai/A and fenoxaprop 0.18 lb ai/A + ethofumesate 1.5 lb ai/A + triclopyr 1.0 lb ai/A on a four and six week reapplication schedule. Spring application also included an experimental compound, EXP-31130A at 0.36 lb ai/A. Sprays were applied using a hand held boom equipped with TeeJet 8003 nozzles calibrated to deliver 43 GPA. Treatments were arranged in a randomized complete block design with 3 replications. Observations for bermudagrass injury (0-10) and tall fescue injury (0-10) were made periodically. Common bermudagrass control was achieved with three to four monthly spring/summer applications of EXP-31130A, fenoxaprop + ethofumesate, fenoxaprop + triclopyr, ethofumesate + triclopyr and fenoxaprop + ethofumesate + triclopyr. Fenoxaprop alone was the only treatment that did not provide acceptable control. Applications made on six week intervals allowed for bermudagrass regrowth and were not as effective as four week application intervals. Herbicide programs that were initiated in the fall were no more effective for common bermudagrass control than those that were initiated in the spring. Hybrid bermudagrass was much more difficult to control than common bermudagrass. As with common bermuda, six week application intervals were ineffective for hybrid bermudagrass control regardless of treatment. When initiated in the fall, monthly applications of fenoxaprop + ethofumesate + triclopyr gave adequate control by mid-summer. The only spring initiated program that gave adequate suppression of hybrid bermudagrass was monthly applications of EXP-31130A. Herbicide programs that had four week application intervals tended to cause greater injury to tall fescue that those that incorporated six week reapplications. Monthly applications of EXP-31130A was the only herbicide program however, that caused intolerable injury. Fall sprays tended to be more injurious than those applied in spring/summer. This was likely due to the slower growth and recovery of tall fescue at that time."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Prinster, M. G., and T. A. Russell. 1997. Common and hybrid bermudagrass (Cynodon spp. ) control in tall fescue with various herbicides and application strategies. South. Weed Sci. Soc. Proc. 50:p. 71.
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