| The introduction of herbicide tolerance into crops has led to the development of herbicide-tolerant volunteers which can be difficult to control and further limit effective control methods available to the producer. The proposed registration of glyphosate-tolerant wheat in North America, since withdrawn, highlighted the knowledge gaps relative to the nature of wheat as a volunteer. The emergence timing of volunteer spring wheat has not been documented, yet emergence timing can affect both efficacy and the synchrony of flowering and gene flow between volunteer and cropped wheat. In addition, in western Canada, volunteer wheat has been shown empirically, to persist for several years, but the mechanisms for this persistence are unknown.; The results of this study suggest that in the eastern Canadian prairie, where fall and spring rainfall are reliable and soil moisture levels are relatively high, volunteer wheat emerges early and does not form a very persistent seedbank. (Abstract shortened by UMI.)... |
