Fire Blight- Erwinia amylovora
Crown Gall - Agrobacterium tumefaciens
Laboratory review: The following links will be activated after this class has met.
Bacteria and Phytoplasma Diseases
For your general information if needed in the future:
List of apple cultivars that are resistant or susceptible to Fire Blight
List of crab apple cultivars evaluated for fire blight (and other diseases)