Blight is a disease caused by the bacterium Erwinia Amylovora and can
be highly destructive to Flowering Crab, Mountain Ash, Choke Cherry,
and Hawthorn. It can also affect some species of the Rose family.
symptom of fire blight is the death of terminal shoots on new growth in
spring or early summer. Branches give the appearance of being burned or
scorched by fire hence the name "fire blight". The shoots will turn
black or brown, and new leaves will droop downward. Once this disease
progresses down the branch it will position itself as a canker in older
parts of the tree or shrub. A good indication of these cankers is an
orange colored material oozing from the diseased parts of the plant.