Not only is common ragweed (Ambrosia artemisiifolia) a weedy, invasive, allergenic and allergy-inducing species, it has also evolved resistance to ALS-inhibiting herbicides. A large-scale study combining “biological” herbicide sensitivity assays and very high throughput sequencing sheds light on the situation of resistance to ALS-inhibiting herbicides in France! Several resistance clusters have been identified in Auvergne-Rhône-Alpes, Centre-Val-de-Loire, Nouvelle-Aquitaine and Occitanie. But the most remarkable result is that the main type of resistance in Ambrosia is non-target resistance, a first for a broadleaf!
The study is here.
The study has also been published in Phytoma (in French).
And the updated resistance maps are here.