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Recent research at Kansas State University has confirmed farmers' claims of reduced herbicide efficacy in controlling Palmer amaranth in fields. According to the research, Palmer amaranth samples, collected from a long-term conservation tillage study, were identified as being resistant to 2,4-D and dicamba. This is the first confirmed case of resistance to dicamba and 2,4-D in Palmer amaranth, further magnifying the  challenge to manage this weed in conservation tillage systems.