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| Web URL(s): | http://www.newss.org/proceedings/proceedings-2015.pdf#page=94
Last checked: 10/23/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary Only |
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| Author(s): | Askew, S. D. |
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| Author Affiliation: | Vice President, NEWSS Executive Committee and Chair, NEWSS 2015 Program Committee and Collegiate Weed Contest Committee, Virginia Tech, Blacksburg |
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| Title: | Reducing visual impact of topramezone on creeping bentgrass fairways using triclopyr admixtures |
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| Meeting Info.: | Williamsburg, Virginia: January 5-8, 2015 |
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| Source: | Proceedings of the Sixty-ninth Annual Meeting of the Northeastern Weed Science Society. Vol. 69, 2015, p. 92. |
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| Publishing Information: | College Park, Maryland: The University of Maryland |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Chemical injury; Discoloration; Eleusine indica; Golf fairways; Herbicide evaluation; Legislation; Poa pratensis; Topramezone; Triclopyr
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| Cultivar Names: | Midnight II |
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| Abstract/Contents: | "Topramezone was registered for use in turfgrass as Pylex herbicide in 2013. Use of topramezone on creeping bentgrass has formerly been prohibited. Preliminary research at Virginia Tech, BASF, and other universities have suggested commercially-viable uses for topramezone may exist in creeping bentgrass turf. Topramezone can cause severe discoloration to creeping bentgrass but turf typically recovers in less than one week. By lowering the use rate to 6 g ai/ha, creeping bentgrass fairway discoloration can be minimized. This rate will control goosegrass when applied once but repeated treatments are needed to control crabgrass or bermudagrass. Even at the 6 g/ha rate, creeping bentgrass discoloration can exceed 50%. Transient creeping bentgrass injury can be tolerated if fairways are treated only once or twice during the season but more applications are needed for some targeted weeds. At Virginia Tech, several studies have indicated triclopyr can eliminate foliar discoloration caused by topramezone. Preliminary studies indicated triclopyr may cause unacceptable injury to creeping bentgrass when used at rates above 70 g ai/ha leading us to hypothesize that the optimal rate to reduce creeping bentgrass discoloration is less than 70 g/ha. Our objectives in 2014 were to evaluate how 35 g/ha triclopyr will influence creeping bentgrass response to topramezone at 6 and 12 g/ha and to demonstrate a broad range of triclopyr rates in mixture with topramezone. Two studies were conducted at the Glade Road Research Facility at Virginia Tech in Blacksburg. Both studies were arranged as randomized complete blocks with 3 replications. Topramezone was applied at 6 and 12 g/ha alone or mixed with 35 g/ha triclopyr. One study consisted of 'L93' creeping bentgrass infested with smooth crabgrass and the other was 'Midnight II' Kentucky bluegrass infested with goosegrass and smooth crabgrass. Both sites were maintained at 1.5 cm mowing height. Topramezone alone injured creeping bentgrass approximately 30 and 70% when applied at 6 and 12 g/ha, respectively. When 35 g/ha triclopyr was added to topramezone, creeping bentgrass was not injured. At the creeping bentgrass site, all treatments completely controlled smooth crabgrass after two treatments at 3-week intervals. Kentucky bluegrass was never injured by topramezone. Goosegrass (3-10 tiller) was controlled 100% by all treatments. Smooth crabgrass was controlled 60% by two treatments of 6 g/ha topramezone alone and 93 to 98% by 12 g/ha topramezone or 6 g/ha topramezone plus 35 g/ha triclopyr. A nonreplicated demonstration indicated that optimal triclopyr rate in mixture with topramezone is between 12 and 35 g/ha. In 2014, the Pylex label was expanded to include uses in creeping bentgrass fairways and these data should help prevent undesirable turfgrass discoloration in this new market." |
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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. 2015. Reducing visual impact of topramezone on creeping bentgrass fairways using triclopyr admixtures. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 69:p. 92. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings-2015.pdf#page=94
Last checked: 10/23/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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