Copper‐based antimicrobial compounds are widely used to control plant bacterial pathogens. Pathogens have adapted in response to this selective pressure. Xanthomonas citri pv. citri , a major citrus pathogen causing Asiatic citrus canker, was first reported to carry plasmid‐encoded copper resistance in Argentina. This phenotype was conferred by the cop LAB gene system. The emergence of resistant strains has since been reported...