Fire blight symptoms on a hawthorne tree. Leaves are brown and dried. Leaves affected by the fire blight bacteria may not abscise, nor will affected fruit or blossoms. Presence of ooze on affected tissues (not shown) is a diagnostic characteristic of the disease.
Pyracantha infected with fire blight. The fire blight pathogen, Erwinia amylovora, will infect young succulent tissue as well as blossoms. This pyracantha shows death of new shoots as well as progressive infection throughout older tissues.
Pyracantha with infected blossoms. Blossoms will generally become infected and show symptoms without progressing into the adjacent tissues.
