Early disease detection and management are essential to ensuring continued viability of the U.S. citrus industry. Rapid communication of new diseases, significant outbreaks, and accurate information are vital. Many diseases are difficult to distinguish from one another or disease symptoms mimic disorder symptoms. Images and description of diseases are helpful in making a correct diagnosis. This tool contains fact sheets, a glossary, an image gallery, and an interactive key to help support identification of citrus diseases of concern to the U.S.