Degradation and Metabolism of Fenoxaprop and Mesosulfuron plus Iodosulfuron in Multiple Resistant Blackgrass (Alopecurus myosuroides)

作者：Kaiser Yasmin Isabelle^*; Gerhards Roland

来源：Gesunde Pflanzen, 2015, 67(3): 109-117.

DOI：10.1007/s10343-015-0343-3

• Herbicide resistance
• Non-target-site resistance
• LC/MS-MS
• ACCase
• ALS
• Weed

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.
The degradation of mesosulfuron + iodosulfuron lasted over 21 days. It was significantly faster in the NTSR than in the sensitive and the TSR populations. The metabolite metsulfuron was found 7 days after treatment in sensitive and resistant populations, without significant differences in the dynamics. The results clearly demonstrate that herbicide metabolism plays an important role in the evolution of herbicide resistant blackgrass populations.

• 出版日期2015-9