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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1987_vol41.pdf#page=5
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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| Content Type: | Abstract or Summary only |
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| Author(s): | Trimmer, Mark C.;
Linscott, Dean L. |
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| Author Affiliation: | Pest/Environment Interactions, USDA-ARS, Cornell University, Ithaca, NY. |
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| Title: | Transpiration of Quackgrass after Postemergence Herbicides |
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| Meeting Info.: | Held: January 6-8, 1987, Williamsburg, VA. |
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| Source: | Proceedings of the 1987 Annual Meeting of the Northeastern Weed Science Society. Vol. 41, 1987, p. 5. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Transpiration; Elymus repens; Postemergence herbicides; Fluazifop; Haloxyfop; Quizalofop; Weed control; Herbicide rates
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| Abstract/Contents: | "One of the most important perennial weeds in the northeast is quackgrass (Agropyron repens (L.) Beauv.). A new group of herbicides, the oxyphenoxypropanoates, have been developed that permit postemergence control of quackgrass in the presence of a broadleaf crop. Growth of quackgrass treated with these herbicides stops within 48 hours, but 10 to 14 days are required before above ground foliage is fully necrotic. Thus, the time after treatment when competition for water from the quackgrass plant is reduced or stopped is unclear. In three separate lavoratory studies, quackgrass was treated with fluazifop-P-butyl, haloxyfop, or quizalifop. Each herbicide was applied in single applications of 0.14, 0.28, and 0.56 kg/ha and also in sequential applications of 0.07 + 0.07, 0.14 + 0.14, and 0.25 + 0.28 kg/ha. In a fourth study, the effects of all three herbicides were compared, each being applied at rates of 0.28 and 0.14 + 0.14 kg/ha. The second treatment of the sequential applications was applied 16 days after the initial spraying. Transpiration and diffusive resistance of the quackgrass were monitored with a steady state porometer for the 35 days after spraying to determine when moisture usage by the treated plants ceased. In comparing herbicide treatment effects, none of the herbicides significantly affects transpiration or diffusive resistance prior to 8 days after spraying. Quackgrass sprayed with quizalifop showed the greatest response to herbicide treatment. There was a marked decrease in transpiration and increase in diffusive resistance of all quizalifop treated quackgrass at 8 days after spraying, with the exception of those plants receiving the 0.07 + 0.07 kg/ha rate. Haloxyfop treated quackgrass exhibited treatment effects almost as quickly as quizalifop. However, the transpiration and diffusive resistance of the treated quackgrass was directly proportional to the rate of haloxyfop applied. Fluazifop-P-butyl had the least effect on quackgrass both in terms of speed of action and in the magnitude of response. Only the highest rate of fluazifop-P-butyl significantly decreases transpiration rate and increases diffusive resistance. There did not appear to be an advantage for sequential applications over single treatments for any of the herbicides." |
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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):
Trimmer, M. C., and D. L. Linscott. 1987. Transpiration of Quackgrass after Postemergence Herbicides. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 41:p. 5. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1987_vol41.pdf#page=5
Last checked: 07/25/2013
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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