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Management Practices Influencing Herbicide Resistance in Wild Oat

  • Hugh J. Beckie (a1), Linda M. Hall (a2), Scott Meers (a3), James J. Laslo (a4) and F. Craig Stevenson (a5)...

A 3-yr study was conducted in Wheatland County, Alberta to determine if agronomic practices of growers influenced the occurrence of herbicide resistance in wild oat. Wild oat seeds were collected in 33 fields in 1997 and in 31 fields in each of 1998 and 1999 (one field per grower). Seedlings were screened for resistance to two acetyl-CoA carboxylase (ACCase) inhibitors, imazamethabenz, an acetolactate synthase (ALS) inhibitor, and triallate, a thiocarbamate herbicide. A questionnaire on herbicide resistance awareness and management practices was completed by each grower. Both ACCase and ALS inhibitor resistance in wild oat were linked to a lack of crop rotation diversity. In addition, ALS inhibitor–resistant wild oat was associated with conservation-tillage systems and recent use of herbicides with that mode of action. Results of this study suggest that timely tillage and inclusion of fall-seeded and perennial forage crops in rotations will effectively slow the selection of resistance in this grass species.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

H. J. Beckie , I. M. Heap , R. J. Smeda , and L. M. Hall 2000. Screening for herbicide resistance in weeds. Weed Technol. 14:428445.

H. J. Beckie , A. G. Thomas , and F. C. Stevenson 2002. Survey of herbicide-resistant wild oat (Avena fatua) in two townships in Saskatchewan. Can. J. Plant Sci 82:463471.

L. Bourgeois and I. N. Morrison 1997. A survey of ACCase inhibitor resistant wild oat in a high risk township in Manitoba. Can. J. Plant Sci 77:703709.

L. Bourgeois , I. N. Morrison , and D. J. Kelner 1997. Field and grower survey of ACCase resistant wild oat in Manitoba. Can. J. Plant Sci 77:709715.

K. N. Harker , K. J. Kirkland , V. S. Baron , and G. W. Clayton 2003. Early-harvest barley (Hordeum vulgare) silage reduces wild oat (Avena fatua) densities under zero tillage. Weed Technol. 17:102110.

A. Légère , H. J. Beckie , F. C. Stevenson , and A. G. Thomas 2000. Survey of management practices affecting the occurrence of wild oat (Avena fatua) resistance to acetyl-CoA carboxylase inhibitors. Weed Technol. 14:366376.

S. R. Moss 2002. Herbicide-resistant weeds. in R.E.L. Naylor , ed. Weed Management Handbook. British Crop Protection Council. Oxford, UK: Blackwell Science. Pp. 225252.

D. C. Thill , J. T. O'Donovan , and C. A. Mallory-Smith 1994. Integrated weed management strategies for delaying herbicide resistance in wild oats. Phytoprotection 75:6170.

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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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