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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=465
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Askew, S. D.;
Willis, J. B. |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Seasonal herbicide programs for selective bermudagrass control in cool-season turf |
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| Section: | Turf and ornamentals
Other records with the "Turf and ornamentals" Section
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| Meeting Info.: | Orlando, Florida: February 9-12, 2009 |
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| Source: | 2009 Proceedings, Southern Weed Science Society. Vol. 62, 2009, p. 395. |
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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; Bermudagrass control; Ethofumesate; Fenoxaprop-ethyl; Herbicide combinations; Herbicide evaluation; Mesotrione; Research; Seasonal maintenance; Siduron; Transition zone; Triclopyr
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| Trade Names: | Speed Zone |
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| Abstract/Contents: | "In the transition climate zone, warm-season grasses and cool-season grasses overlap in growing regions. Problems arise when warm-season grasses like bermudagrass (Cynodon dactylon) invade cool-season turfgrasses like Kentucky bluegrass (Poa pratensis) and tall fescue (Festuca arundinacea). Recent research at Virginia Tech developed control programs for bermudagrass in tall fescue that consisted of mesotrione, fenoxaprop, and triclopyr combinations applied 3 times in spring and 3 times in fall. These programs were highly effective for selective bermudagrass control in Kentucky bluegrass, tall fescue, and perennial ryegrass (Lolium perenne). Unfortunately, this program exceeds EPA maximum use limits per year for mesotrione. There are five herbicides that can be used in either tall fescue or Kentucky bluegrass and that may suppress or control bermduagrass. These include mesotrione, triclopyr, fenoxaprop, siduron, and ethofumesate. Our objectives are to evaluate seasonal programs that include these five active ingredients to selectively control bermudagrass while adhering to annual use limits. Treatments were arranged in a randomized complete block design with 13 treatments and 3 replications. Comparison treatments included a nontreated control, a positive control that consisted of renovation with glyphosate applied twice at 5.6 kg ai/ha and seed, and a negative control that consisted of prodiamine applied at label rates for crabgrass control and a broadleaf herbicide (Speedzone by PBI Gordon) applied at label rates for broadleaf weed control. Bermudagrass control treatments consisted of various combinations of mesotrione at 0.14 kg ai/ha, triclopyr at 1.12 kg ai/ha, ethofumesate at 0.84 kg ai/ha, siduron at 13 kg ai/ha, and fenoxaprop at 0.14 kg ai/ha. The industry standard comparison was called the "Carolina program" and consisted of fenoxaprop plus triclopyr applied monthly for four treatments. The original Virginia Tech 3-way combination was also included as a comparison treatment. The best performing program was called "VT Modified I" and consisted of fenoxaprop plus triclopyr applied twice at 3 week intervals starting at 50% bermudagrass greenup and two more times just prior to bermudagrass dormancy in the fall. Two additional mesotrione treatments were applied mid summer. This program controlled bermudagrass 93% at season's end with minimal turf injury. By comparison, the Carolina program controlled bermudagrass 76% and less than VT Modified I and the original VT 3-way program controlled bermudagrass 87% and equivalent to VT Modified I. Programs that included triclopyr mid summer, including the Carolina program, were too injurious too Kentucky bluegrass. Siduron did not improve bermudagrass control. As with any bermudagrass control evaluation, next year's evaluations will become the basis of control evaluations as next year's recovery must be considered for program performance. These evaluations will be forthcoming in the 2009 season." |
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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):
Askew, S. D., and J. B. Willis. 2009. Seasonal herbicide programs for selective bermudagrass control in cool-season turf. South. Weed Sci. Soc. Proc. 62:p. 395. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=465
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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