Seed bank persistence of genetically modified canola in California

Munier, Douglas J.; Brittan, Kent L.; Lanini, W Thomas

Seed bank persistence of genetically modified canola in California

2012

Munier, Douglas J. | Brittan, Kent L. | Lanini, W Thomas

INTRODUCTION: Canola, which is genetically modified (GM) for tolerance to glyphosate, has the potential to become established as a new glyphosate resistant weed, thus reducing the effectiveness of glyphosate. METHODS: Volunteer from dormant canola seeds produced thousands of plants per hectare in the fourth year (2011) following a 2007 crop harvest. This occurred with no additional canola seed production since the 2007 harvest. RESULTS: Volunteer plants following harvests of annual crops are typically only a problem for the first year after harvest. In California, glyphosate is the core herbicide on over a million hectares of high value row, tree, and vine crops and new glyphosate resistant weeds reduce the effectiveness of glyphosate. CONCLUSIONS: The combination of dormant seed and herbicide resistance makes GM glyphosate-resistant canola a new and difficult California weed which was first observed in the winter of 2009.

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