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| Web URL(s): | http://wssaabstracts.com/public/17/abstract-240.html
Last checked: 04/18/2013
http://wssaabstracts.com/public/17/proceedings.html
Last checked: 04/18/2013
Notes: Item is within a single large file
http://www.newss.org/proceedings/proceedings-2013.pdf#page=107
Last checked: 01/15/2016
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): | Spak, D. R.;
Askew, S. D.;
Myers, D.;
Cox, M.;
Parker, A. |
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| Author Affiliation: | Spak and Myers: Bayer CropScience, Cary, NC; Askew and Cox: Virginia Tech, Blacksburg, VA; Parker: Bayer CropScience, Clayton, NC |
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| Title: | Investigating a suspected oxadiazon-resistant goosegrass population in turf |
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| Section: | Turf and ornamental crops I
Other records with the "Turf and ornamental crops I" Section
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| Meeting Info.: | Baltimore, Maryland: February 4-7, 2013 |
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| Source: | Proceedings of the Sixty-Seventh Annual Meeting of theNortheastern Weed Science Society. Vol. 67, 2013, p. 96. |
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| Publishing Information: | Baltimore, Maryland: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Eleusine indica; Evaluations; Herbicide resistance; Oxadiazon
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| Abstract/Contents: | "Oxadiazon is a preemergent herbicide that has been used commercially for control of annual grasses, including goosegrass (Eleusine indica) in warm season turf since it was registered in the late-1970's. During 2009 and 2010, a golf course superintendent in the Richmond, VA area began to experience lack of goosegrass control with oxadiazon applied at 3.4 to 4.5 kg ai/ha. This golf course had successfully used oxadiazon for preemergence goosegrass control since it opened in the early 1990's. In 2011, Virginia Tech and Bayer CropScience LP independently sampled escaped goosegrass plants/seed and tested to determine if herbicide resistance might explain the lack of product performance. Six unique ecotypes or seed sources were tested. Seed of native goosegrass was collected near Clayton, NC and Blacksburg, VA in areas known to have no prior history of oxadiazon use to serve as wild type comparisons. Three mature goosegrass plants collected from the Richmond, VA golf course served as seed donors for three suspected resistant ecotypes that were evaluated in the study by Bayer. A composite of seed from plants growing at random locations on previously oxadiazon-treated fairways at the same golf course was collected for use in the Virginia Tech trial. Approximately 100 seeds were evenly spread over a soil-mix (3 part sand: 1 part potting soil) packed lightly, then irrigated with enough water to allow soil to settle and drain for 24 hrs. Seed was then topdressed lightly with dry sand and irrigated lightly to encourage seed/soil settling. Pots were treated with Ronstar FLO (380 g oxadiazon/L) in a spray chamber equipped with flat fan nozzles at a spray volume of 373 L/ha. Treatments included oxadiazon applied at rates of 4.48, 3.4, 2.2, 1.1, 0.56, 0.28, 0.14, 0.07, and 0.03 kg ai/ha. Specticle FLO (indaziflam at 0.05 kg ai/ha) and Barricade (prodiamine at 0.84 kg ai/ha) were included as reference standards. Pots were then placed in a greenhouse and irrigated regularly to encourage seed germination. Emerged seedlings were counted weekly. Seedling counts were transformed to percent reduction of counts in nontreated pots and oxadiazon rate responses were fit to the hyperbolic function using Proc Nlin in SAS. Estimated i values and LC95 values that were subjected to ANOVA to test for differences in lethal concentration required to reduce seedling counts between ecotypes/seed sources. Seedling population reductions for all seed sources fit the hyperbolic function in response to oxadiazon rate with wild-type plants (WT) having rapid ascent to 100% reduction compared to slower ascents from suspected resistant plants (SR). Estimated i values from WT seed were several orders of magnitude higher than i values from SR plants. The SR population in Virginia Tech trials required an estimated 16.5 kg ai/ha oxadiazon to kill 95% of the population at 9 WAT while the Virginia Tech WT seed required only 0.5 kg ai/ha. Likewise, WT seed was 24, 45, 87, and 105 times more susceptible to oxadiazon than SR plants in the studies conducted by Bayer in North Carolina. Seedlings were never observed in the pots treated with prodiamine or indaziflam at any time in any study. Based on these results, the goosegrass collected from the Richmond golf course has tested positively for oxadiazon resistance. Oxadiazon is a PPO inhibitor with no documented cases of annual grass resistance globally. This is the first reported case of herbicide resistance development of an annual grass to oxadiazon. It is not known if this is an isolated biotype or if other sites may also be at risk. However, it does indicate that the potential to develop resistance is relatively low given the ~20 years of use at the golf course where resistant goosegrass was found and over 40 years of general use after introduction, but resistance management strategies should be implemented before options become limited." |
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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):
Spak, D. R., S. D. Askew, D. Myers, M. Cox, and A. Parker. 2013. Investigating a suspected oxadiazon-resistant goosegrass population in turf. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 67:p. 96. |
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| Web URL(s):
http://wssaabstracts.com/public/17/abstract-240.html
Last checked: 04/18/2013
http://wssaabstracts.com/public/17/proceedings.html
Last checked: 04/18/2013
Notes: Item is within a single large file
http://www.newss.org/proceedings/proceedings-2013.pdf#page=107
Last checked: 01/15/2016
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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Digitally in TIC by file name: newss2013 |
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