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 abiotic issues tree burls

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.
Here is more information on our website.
http://extension.umd.edu/hgic/burls-trees-and-shrubs

Marian