Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Mountain Ash > Spots, blotches or discolored fruit
Mountain Ash > Fruit > Spots, blotches or discolored fruit
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Fire blight
Erwinia amylovora
- Infected fruit are shriveled and discolored
- Branch cankers have dark, sunken and cracked bark, sapwood is streaked reddish brown
- Drops of sticky honey colored liquid can be seen on infected plant parts in warm wet weather
- 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
- More information on fire blight
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Branch cankers
Botryosphaeria dothidea
- Sunken brown spots on fruit, can grow to rot part or all of fruit
- Leaves on girdled branches wilt, die and turn brown
- Small blister like spots on branches exude, watery fluid
- Branch infections grow to cracked, flakey, orange canker
- More information on canker
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Apple scab
Venturia inaequalis
- Olive green to brown leaf spots with an irregular or feathered edge, eventually becoming a dark brown to black
- Infected leaves turn yellow and drop prematurely
- More information on Apple scab
