1189 samples of mainly common redroot, ryegrass, brome, and wind grass have been analyzed so far. It turns out that one or the other resistance can be detected in all of these weeds. The picture is particularly diverse in the case of ryegrasses and common redroot, where either the ALS, the ACCase or both herbicide groups are affected. However, in brome and wind grass we only found resistance to ALS inhibitors. Interestingly, resistance can not only be detected in fields in which a high level of residual weeds was found, but also in those areas where farmers still observe good weed control today. These could be the potential problems of tomorrow and these agricultural areas must be closely monitored over the next few years.

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