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Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=267 Last checked: 08/07/2013 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Author(s): | Enloe, S. F.;
Belcher, J. L. |
Author Affiliation: | Auburn University, Auburn, AL |
Title: | Cogongrass response to fall and spring treatments of aminocyclopyrachlor |
Section: | Invasive plant species Other records with the "Invasive plant species" Section
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Meeting Info.: | Charleston, South Carolina: January 23-25, 2012 |
Source: | 2012 Proceedings, Southern Weed Science Society. Vol. 65, 2012, p. 195. |
Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Aminocyclopyrachlor; Application timing; Herbicide efficacy; Herbicide evaluation; Herbicide injury; Imperata cylindrica; Roadside turf
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Abstract/Contents: | "Aminocyclopyrachlor is a new pyrimidine carboxylic acid herbicide that has activity on a wide range of troublesome broadleaf weeds that infest roadsides and rights of ways. Recent research has shown that this synthetic auxin may also have some selective activity against certain weedy grasses such as cogongrass that are problematic in roadside turf. Given that currently available herbicide options for cogongrass control on roadsides are all non-selective, any additional selective tools would be extremely useful. Our objective was to evaluate aminocyclopyrachlor applied at fall or spring timings against glyphosate and imazapyr for cogongrass rhizome, shoot, and flowering control. Studies were established in heavily infested fields near Bayou LaBatre and Theodore, Alabama in 2009 to compare fall (October) and spring (May) application timings of aminocyclopyrachlor (0.28 kg/ha) , glyphosate (3.36 kg/ha) and imazapyr (0.84 kg/ha). Methylated seed oil (1% v/v) was added to each aminocyclopyrachlor and imazapyr treatment and a nonionic surfactant (0.25% v/v) was added to the glyphosate treatment. Treatments were broadcast applied at 187 l/ha to green, actively growing cogongrass at each treatment timing. Cogongrass flowering and vegetative cover data were collected during the growing season after treatment timing and rhizome biomass was also quantified at twelve months after each treatment timing. At 12 MAT, aminocyclopyrachlor reduced rhizome biomass by 30% compared to the untreated control, while glyphosate and imazapyr reduced rhizome biomass by 79 and 83%, respectively. Both fall and spring treatment timings resulted in a similar pattern of good spring cogongrass suppression followed increasing cogongrass cover over the summer. For aminocyclopyrachlor this pattern always resulted in significantly less cogongrass control than either glyphosate or imazapyr. Fall herbicide treatments reduced flowering by 99% and spring treatments reduced flowering by 92% at 12 MAT. Additional studies were also conducted near Bay Minette, Alabama to quantify the impact of repeated fall aminocyclopyrachlor treatments on cogongrass control. Treatments were applied in September or October for two consecutive years at two field sites using rates of 0.07, 0.14, 0.21, 0.28, and 0.56 kg/ha with methylated seed oil at 1% v/v. Visual control and flowering response were evaluated each spring following treatment. Dose response modeling indicated that cogongrass flowering was inhibited at a much lower rate than cogongrass vegetative cover. These results indicate that aminocyclopyrachlor does provide short term vegetative control of cogongrass and can strongly inhibit flowering. This ability to prevent cogongrass flowering while selectively suppressing vegetative cover may allow aminocyclopyrachlor to be useful in certain roadside situations." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Enloe, S. F., and J. L. Belcher. 2012. Cogongrass response to fall and spring treatments of aminocyclopyrachlor. South. Weed Sci. Soc. Proc. 65:p. 195. |
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| Web URL(s): http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=267 Last checked: 08/07/2013 Requires: PDF Reader Notes: Item is within a single large file |
| MSU catalog number: b2207931 |
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