6533b853fe1ef96bd12ad314

RESEARCH PRODUCT

Exploitation des données d’epidémiosurveillance à l’échelle de la décade : les pratiques culturales en colza influencent aussi indirectement la composition de la de la flore adventice du blé d’hiver

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The ‘Biovigilance Flore’ national weed survey gathers about 5400 field data over 714 communes and 9 years. At this spatial and temporal scale, it is possible to partition the impact of different factors on weed flora and to highlight differences between generalist species and species more specialized to particular environmental or agricultural conditions. In this article, we analyzed and compared changes in weed flora of both oilseed rape and winter wheat. Results showed that a part of changes observed in winter wheat can be attributed to new species ‘entering’ or increasing their frequencies in oilseed rape. On one hand, this results stress the importance of considering the crop rotation scale for understanding the weed flora that emerged through the soil seed bank of each field. On the other hand, this also provides some new perspectives for managing weed flora on a timescale that accounts for partial and cumulative effects of some practices.