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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2010.pdf#page=93
Last checked: 07/22/2013
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): | Alea, S.;
Hart, S.;
Mansue, C. |
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| Author Affiliation: | Rutgers University, New Brunswick, NJ |
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| Title: | Weed control and cool season turfgrass response to metamifop |
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| Meeting Info.: | Cambridge, MA: January 4-7, 2010 |
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| Source: | Proceedings: 64th Annual Meeting of the NortheasternWeed Science Society. Vol. 64, 2010, p. 77-78. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Fenoxaprop-ethyl; Herbicide efficacy; Herbicide evaluation; Metamifop; Poa pratensis; Postemergence weed control
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| Abstract/Contents: | "Field studies were conducted in 2008 and 2009 to evaluate postemergence grassy weed control and cool-season turfgrass tolerance to metamifop. Grassy weed control studies were conducted on high infestations of crabgrass and goosegrass, while turf tolerance trials were conducted on highly maintained, weed free stands of Kentucky bluegrass and creeping bentgrass. Metamifop was applied at rates ranging from 100 to 400 g ai/ha as single or sequential applications (at 3 week intervals) in crabgrass and goosegrass control studies. Fenoxaprop was included in all studies as a comparison at 100 g/ha. In 2008, single applications of metamifop at 200 or 400 were equally as effective fenoxaprop at 100 g/ha in controlling 3-4 leaf and 2-3 tiller crabgrass. In 2009, metamifop applied at 200-400 g/ha provided 81 to 94% crabgrass control 3 weeks after initial treatment (WAIT) and was equivalent to fenoxaprop applied at 100 g/ha. At 6 WAIT crabgrass control with single applications of metamifop at 200-300 g/a was equivalent (ranging from 75-88% control) to fenoxaprop at 100 g/ha. However, increasing the rate of metamifop to 400 g/ha increased control to 96% which was superior to single applications of fenoxaprop. Sequential applications of both herbicides provided 95-99% crabgrass control 6 WAIT. In a crabgrass timing study, metamifop applied at 200 or 400 g/ha or fenoxaprop at 100 or 200 g/ha provided nearly complete control of 3-4 leaf crabgrass 4 WAT. Metamifop at 200 g/ha and fenoxyprop at 100 and 200 g/ha provided equivalent control of 1-2 tiller crabgrass at 4 WAT (79-88%). Metamifop at 400 g/ha provided 96% control which was superior to metamifop at 200 g/ha (79%) and fenoxaprop at 100 g/ha (85%). Control of 3-4 tiller crabgrass was equivalent (78-83% when metamifop was applied at 200 g/ha and fenoxaprop applied at 100 or 200 g/ha. However, metamifop applied at 400 g/ha provided superior crabgrass control (95%) relative to the other treatments. Control of 6+ tiller crabgrass was equivalent (73 to 80%) with metamifop at 200 or 400 g/ha and fenoxaprop at 100 g/ha. However, control was greatest at 89% with fenoxaprop at 200 g/ha. Goosegrass control studies conducted in 2008 demonstrated that control of 3-4 leaf goosegrass was equivalent with metamifop applied at 200 g/ha and fenoxaprop at 100 g/ha. However goosegrass control was only 74% with metamifop applied at 100 g/ha. Control of 2-3 tiller goosegrass was equivalent with metamifop at 200 or 400 g/ha and fenoxaprop at 100 g/ha ranging from 83 to 94% at 4 WAT. Metamifop applied at 100 g/ha was ineffective for 2-3 tiller goosegrass control. The results of these studies suggest that metamifop shows excellent potential (that is similar to fenoxaprop) for multi-tillered crabgrass and goosegrass control at application rates ranging from 200-400 g/ha. In 2008 Kentucky bluegrass tolerance studies, single applications of metamifop applied at 200-800 g/ha and sequential applications applied at 200-400 g/ha caused less than 3% injury to Kentucky bluegrass. Fenoxaprop applied at 200 g/ha caused 18 and 11% injury at 10 and 22 days after treatment (DAT) respectively. In 2009, Kentucky bluegrass injury was not evident at metamifop rates of 800 g/ha or lower at 1 WAT. Metamifop applied at 1600 and 3200 g/ha caused 10 and 25% injury, respectively. At 3 WAT, visual injury was only evident at 3200 g/Ha of metamifop. In contrast, Kentucky bluegrass injury from fenoxaprop applied at 100 to 400 g/ha ranged from 14 to 40% at 1 WAT and increased to 10 to 66% at 2 WAT. Noticeable injury was still evident with fenoxaprop treatments at 3 WAT. In 2008 creeping bentgrass tolerance studies (maintained at 0.9 cm) injury ranged from 5 to 13% from initial applications of metamifop 1 WAT. However, injury was only evident from 800 g/ha metamifop 2 WAT. Sequential applications of these same rates of metamifop caused 10% or less injury to creeping bentgrass at any evaluation timing. In 2009, (creeping bentgrass maintained at 0.4 cm) initial applications of metamifop at 800 g/ha, fenoxaprop at 35 g/ha and quinclorac at 170 g/ha caused 9, 14 and 30% injury, respectively, 1 WAT. Injury from these treatments increased to 29, 23, and 35%, respectively, at 3 WAT. However, creeping bentgrass rapidly recovered and no injury was observed at 5 WAT. Metamifop applied at 200 and 400 g/ha and fenoxaprop applied at 18 g/ha did not cause significant injury to creeping bentgrass. Turfgrass tolerance studies suggest that metamifop may be used at much higher rates than required for weed control in Kentucky bluegrass leading to a much wider margin of safety relative to fenoxaprop. This may allow for more aggressive use of metamifop to control larger crabgrass and goosegrass as well as bermudagrass. The relative tolerance of creeping bentgrass to metamifop and fenoxaprop warrant further investigation. While far from conclusive, creeping bentgrass maintained at fairway and greens height appears to be tolerant to 200-400 g/ha of metamifop allowing for potential control of larger crabgrass plants relative to fenoxaprop at 18 g/ha." |
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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):
Alea, S., S. Hart, and C. Mansue. 2010. Weed control and cool season turfgrass response to metamifop. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 64:p. 77-78. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2010.pdf#page=93
Last checked: 07/22/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 60 |
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