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| Web URL(s): | http://www.newss.org/proceedings/proceedings-2014.pdf#page=24
Last checked: 10/05/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Cox, M. C.;
Collakova, E.;
Askew, S. D. |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Physiological response of five goosegrass populations to oxadiazon |
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| Meeting Info.: | Philadelphia, Pennsylvania: January 6-9, 2014 |
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| Source: | Proceedings of the Sixty-eighth Annual Meeting of the Northeastern Weed Science Society. Vol. 68, 2014, p. 23. |
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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: Cynodon dactylon; Electrolyte leakage; Eleusine indica; Oxadiazon; Physiological responses; Preemergence weed control; Weed resistance to herbicides; Winterkill
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| Geographic Terms: | Virginia |
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| Abstract/Contents: | "Virginia lies near the northern extreme of preferable growing conditions for bermudagrass (Cynodon dactylon L. (Pers.)), and yet over half of Virginia golf courses and a third of athletic fields have bermudagrass turf. In Virginia, cumulative bermudagrass growing degree days can be five times lower than areas further south, winter-kill is an annual threat, and the growing season is approximately 130 days. For these reasons, Virginia turf managers typically do not use root-inhibiting herbicides on bermudagrass turf. Oxadiazon has become the herbicide of choice for preemergence weed control in bermudagrass throughout Virginia, and most practitioners have used it exclusively for over 20 years. Although successful for the previous two decades, oxadiazon at 3.4 to 4.5 kg ai ha-1 failed to control goosegrass (Eleusine indica L. (Gaertn.)) at a golf course near Richmond, VA. This control failure in 2009 and 2010 prompted studies by Virginia Tech and Bayer CropScience to determine if escaped goosegrass plants had become resistant to oxadiazon. Greenhouse trials conducted in Blacksburg, VA and Clayton, NC evaluated oxadiazon at rates of 0.03 to 4.48 kg ai ha-1 and determined that goosegrass plants grown from seed of escaped plants at the aforementioned golf course survived preemergence oxadiazon more than wild-type (WT) plants. No previous occurrences of oxadiazon resistance have been documented anywhere in the world. Several cases of protoporphyrinogen oxidase (PPO) inhibitor resistance have been documented in the last two decades; however, no resistance to oxadiazon has been reported. Additionally, all PPO resistance cases have been from postemergence applications to broadleaf weeds only. Given the uniqueness of potential oxadiazon resistance in goosegrass, research is needed to further characterize the nature of resistance. Laboratory bioassays conducted at the Glade Road Research Facility of Virginia Tech in Blacksburg, VA measured electrolyte leakage from newly germinated goosegrass seedlings as influenced by goosegrass accession and oxadiazon concentration. Subsequent studies measured absorbed and translocated oxadiazon in WT and suspected-resistant (SR) goosegrass seedlings by detecting oxadiazon from plant extracts on a gas chromatography mass spectrometer (GC-MS). Electrolyte leakage data were fitted to the hyperbolic function, and variance of estimated parameters, I and a, was analyzed using the general linear model in SAS. Significant difference in I and a values (p<0.01) were noted for the three SR accessions and two WT populations. The WT populations had the highest asymptote for electrolyte leakage percentage, but only WT-1 was significantly higher than SR plants. Electrolyte leakage data suggest that physiological resistance to oxadiazon exhibited by SR plants is not absolute, as the response over oxadiazon rates was similar to WT plants but generally of lower magnitude. Absorption, translocation, and metabolism studies of oxadiazon in the aforementioned goosegrass populations are currently underway and will be discussed at the meeting." |
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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):
Cox, M. C., E. Collakova, and S. D. Askew. 2014. Physiological response of five goosegrass populations to oxadiazon. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 68:p. 23. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings-2014.pdf#page=24
Last checked: 10/05/2015
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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