Abstract
Whole-plant glasshouse experiments were conducted to examine herbicide resistance in selected populations of blackgrass (Alopecurus myosuroides HUDS.). Three populations with either non-target-site resistance (NTSR) or target-site resistance (TSR) showed reduced sensitivity to the herbicides fenoxaprop and mesosulfuron + iodosulfuron. Degradation and metabolism of these herbicides were investigated using a liquid chromatography followed by tandem mass spectrometry. Fenoxaprop degraded in sensitive and resistant populations within 144 h after treatment without significant differences among populations. Fenoxaprop-P, the acid metabolite of fenoxaprop, was found in all populations. The dynamics of fenoxaprop-P differed significantly with an enhanced degradation of the substance in NTSR populations. The metabolite 6-chlorobenzoxazol-2(3H)-one could be detected in all populations 2 h after treatment and degraded almost completely within 144 h.
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