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Regional study of herbicide resistance of Alopecurus myosuroides Huds. in France

Summary
Since the 1990s in the north-west of Europe, the spread of herbicide resistance in wheat weeds such as Alopecurus myosuroides Huds. (blackgrass) is becoming more and more important. In the French administrative district Côte d’Or resistance to fenoxaprop within A. myosuroides populations was first detected in 1996. In 2003, 149 fields from this district were randomly sampled and about 125 A. myosuroides populations were tested for herbicide resistance. The agronomic history of all sites was investigated. Most the populations of A. myosuroides investigated contained at least 50 % of plants with resistance to fenoxaprop. In 53 and 9 % of these populations at least 50 % of plants were resistant to flupyrsulfuron and to clodinafop, respectively. Only one population could be considered as resistant to isoproturon. Strategies for A. myosuroides control are discussed in the light of this work. Herbicide resistance of A. myosuroides in the district Côte d’Or was mapped using GIS and the software Arcview®.

german version

Keywords/Stichworte: Alopecurus myosuroides ; herbicide; herbicide resistance; cultural practices; mapping; GIS; Arcview®

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