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| DOI: | 10.1614/WS-D-15-00107.1 |
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| Web URL(s): | http://www.bioone.org/doi/pdf/10.1614/WS-D-15-00107.1
Last checked: 01/26/2016
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http://www.bioone.org/doi/10.1614/WS-D-15-00107.1
Last checked: 02/02/2016
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | McCullough, Patrick E.;
Yu, Jialin;
Czarnota, Mark A.;
Raymer, Paul L. |
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| Author Affiliation: | McCullough: Associate Professor; Yu: Postdoctoral Researcher; Raymer: Professor, Crop and Soil Sciences Department; Czarnota: Associate Professor, Department of Horticulture, University of Georgia, Griffin, GA |
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| Title: | Physiological basis for metamifop selectivity on bermudagrass (Cynodon dactylon) and goosegrass (Eleusine indica) in cool-season turfgrasses |
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| Section: | Physiology/chemistry/biochemistry
Other records with the "Physiology/chemistry/biochemistry" Section
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| Source: | Weed Science. Vol. 64, No. 1, January-March 2016, p. 12-24. |
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| Publishing Information: | Champaign, Illinois: Weed Science Society of America |
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| # of Pages: | 13 |
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| Related Web URL: | http://www.bioone.org/doi/abs/10.1614/WS-D-15-00107.1
Last checked: 02/02/2016
Notes: Abstract only |
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| Keywords: | TIC Keywords: Acetyl-CoA carboxylase inhibitors; Agrostis stolonifera; Bermudagrass control; Cool season turfgrasses; Cynodon dactylon; Eleusine indica; Goosegrass control; Herbicide evaluation; Herbicide selectivity; Herbicide trials; Metamifop; Plant metabolism; Poa pratensis; Postemergence herbicides; Weed control
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| Abstract/Contents: | "Bermudagrass and goosegrass are problematic weeds with limited herbicides available for POST control in creeping bentgrass. Metamifop effectively controls these weeds with greater selectivity in cool-season grasses than other ACCase inhibitors. The objectives of this research were to determine the physiological basis for metamifop selectivity in turfgrasses. In greenhouse experiments, metamifop rate required to reduce shoot biomass 50% from the nontreated (GR50) at 4 wk after treatment was > 6,400, 2,166, and 53 g ai ha-1 for creeping bentgrass, Kentucky bluegrass, and goosegrass, respectively. The GR50 for bermudagrass treated with diclofop-methyl or metamifop was 2,850 and 60 g ha-1 , respectively. In laboratory experiments, peak absorption of 14C-metamifop was reached at 48, 72, and 96 h after treatment (HAT) for goosegrass, creeping bentgrass and Kentucky bluegrass, respectively. Grasses translocated , 10% of the absorbed radioactivity out of the treated leaf at 96 HAT, but creeping bentgrass translocated three times more radioactivity than goosegrass and Kentucky bluegrass. Creeping bentgrass, Kentucky bluegrass, and goosegrass metabolized 16, 14, and 25% of 14C-metamifop after 96 h, respectively. Goosegrass had around two times greater levels of a metabolite at retention factor 0.45 than creeping bentgrass and Kentucky bluegrass. The concentration of metamifop required to inhibit isolated ACCase enzymes 50% from the nontreated (I50) measured > 100, > 100, and 38 μM for creeping bentgrass, Kentucky bluegrass, and goosegrass, respectively. In other experiments, foliar absorption of 14C-metamifop in bermudagrass was similar to 14C-diclofop-methyl. Bermudagrass metabolized 23 and 60% of the absorbed 14C-diclofop-methyl to diclofop acid and a polar conjugate after 96 h, respectively, but only 14% of 14C-metamifop was metabolized. Isolated ACCase was equally susceptible to inhibition by diclofop acid and metamifop (I50 5 0.7 μM), suggesting degradation rate is associated with bermudagrass tolerance levels to these herbicides. Overall, the physiological basis for metamifop selectivity in turfgrass is differential levels of target site inhibition." |
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| Language: | English |
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| References: | 40 |
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| Note: | Equation
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCullough, P. E., J. Yu, M. A. Czarnota, and P. L. Raymer. 2016. Physiological basis for metamifop selectivity on bermudagrass (Cynodon dactylon) and goosegrass (Eleusine indica) in cool-season turfgrasses. Weed Sci. 64(1):p. 12-24. |
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| DOI: 10.1614/WS-D-15-00107.1 |
| Web URL(s):
http://www.bioone.org/doi/pdf/10.1614/WS-D-15-00107.1
Last checked: 01/26/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website
http://www.bioone.org/doi/10.1614/WS-D-15-00107.1
Last checked: 02/02/2016
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2203399a |
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