Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Mountain Ash > Discolored area on trunk or branches
Mountain Ash > Branches > Discolored area on trunk or branches
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Fire blight
Erwinia amylovora
- Branch cankers have dark, sunken and cracked bark, sapwood is streaked reddish brown
- Infected leaves wilt, turn gray then dark brown
- Young shoots bend over forming a "shepherd's crook"
- Infected blossoms first turn gray, then black
- Infected leaves and blossoms remain attached to the tree, often even in winter
- Infected fruit are shriveled and discolored
- Drops of sticky honey colored liquid can be seen on infected plant parts in warm wet weather
- More information on fire blight
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Branch cankers
Botryosphaeria dothidea
- Small blister like spots on branches exude, watery fluid
- Leaves on girdled branches wilt, die and turn brown
- Branch infections grow to cracked, flakey, orange canker
- Sunken brown spots on fruit, can grow to rot part or all of fruit
- More information on canker
