Citrus Canker Disease Basic Info: Citrus canker is a major disease of citrus that is caused by the bacterial plant pathogen Xanthomonas axonopodis pv. citri (Xac). While this bacterial pathogen is not harmful to humans, pets, or other animals, citrus canker can damage and reduce the marketability of affected citrus fruit and is subject to USDA-APHIS quarantine regulations. Citrus … Continue reading Citrus Canker