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For weeds such as ryegrass, wild oats, and wild radish, this weed seed can be herbicide resistant and it is possible for growers to unwittingly introduce resistance to crop fields... In 2006 a field experiment was established to evaluate the evolution of resistance to diclofop-methyl... Clethodim is widely used to control otherwise resistant ryegrass clethodim resistance is increasing in ryegrass populations (Owen et al. 2007)...