Crab Apple Trees
Q.

flowering crab tree

Zone cornwall ontario canada k6h0c7 | johnkii added on July 31, 2017 | Answered

The leaves are drying up and falling off, and the bark is also drying and flaking off.

A.
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Downtoearthdigs
Certified GKH Gardening Expert
Answered on August 12, 2017

From the symptoms it sounds as if your crabapple has apple scab caused by the fungus Venturia inaequalis that also infects eating apples.
These links have more information.

https://www.gardeningknowhow.com/ornamental/trees/crabapple/flowering-crabapple-trees.htm
https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/managing-apple-scab/

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