Nodules on tree

Asked April 16, 2019, 10:33 AM EDT

what causes this on the tree in the photo. Fair Hill DNR near Big Elk Creek

Cecil County Maryland

1 Response

This looks like burls on the tree trunk. The cause of most burls cannot be explained. This can be a physical response to insects, bacteria, fungi, mistletoes, some genetics, or environmental injury, such as freeze damage. Some trees that may have burls include oaks, maples, cherries, hackberries, etc.
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