Informational table showing disease name, symptoms, pathogen/cause, and management of Amelanchier diseases. (Shadbush, Serviceberry) Disease Symptoms Pathogen/Cause Management Fire blight Infected flowers are killed and often remain attached throughout the season. The ends of twigs and branches become brown or black and may curl over into a shepherd's crook shape. Dead leaves may remain attached to the tree. Cankers formed the previous season may ooze a cloudy liquid during wet spring weather. Branches will be killed as slightly sunken cankers enlarge into larger branches and even into the main trunk. Erwinia amylovora During dormancy when the weather is dry, prune infected branches, cutting at least 4 inches below the base of the canker. Disinfest pruning tools frequently. Fertilize carefully to avoid promoting excessive succulent growth. Remove root suckers and water sprouts while they are small. Remove nearby unwanted plants that are susceptible to fire blight. Rust Brownish-orange spots up to Gymnosporangium spp. Do not plant close to junipers. Remove unwanted junipers from the vicinity. Apply a fungicide to protect plants. Witches' broom Abnormal numbers of shoots develop along branches. Black fungal growth coats the undersides of leaves. Apiosporina No control is recommended.

Prepared by Gary W. Moorman, Professor of Plant Pathology