Burl infection

Asked April 16, 2019, 1:54 PM EDT

Many of our mature trees have suddenly developed ugly infestations of burls along their trunks. Is there anything we can/should do to treat the infected trees? Is there anything we should do to protect the trees which have not yet been infected??? Thank you Ellicott City, MD

Howard County Maryland

1 Response

No treatment is necessary and removal of the burl may damage the tree and is not recommended. There is nothing that you can do.

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

Marian