Bacterial Canker
Bacterial Canker Symptoms
Click photo for what causes Bacterial Canker
Disease Name
Bacterial Canker

Scientific Name
Clavibacter michiganensis ssp. michiganensis
Margins of lower leaves start turning brown and one side of the leaf may wilt. Entire leaves and branches start to die. Yellowish streaks may develop along stems and sunken, brown spots (cankers) may develop. The inside of the infected stems turns yellow then brown, and the pith may collapse. Yellow ooze may appear on the cut ends of infected stem sections. Superficial symptoms on fruit may be observed at any age, but are usually seen first on green fruit 1/2-2 inches in diameter. White spots 1/8 inch in diameter develop on the most-exposed parts of the fruit. The spots have a dark brown center, which becomes raised, and are surrounded by a distinct white halo; they have been termed "bird's-eye spots". Sometimes the spots lose the white halo and become necrotic, and may merge with others.