My Kwanzan cherry tree branches are rotting. Can you provide info on this? I...

Asked July 23, 2014, 12:51 PM EDT

My Kwanzan cherry tree branches are rotting. Can you provide info on this? I took a photo, but it is over 5MB; I don't have the know-how to reduce the file size, thus, I can'tsend it through this method of contact. Thanks GP

Baltimore County Maryland

3 Responses

At this point we are not sure of what you are dealing with on your cherry tree. It would be helpful to send photos of the whole tree and affected branches. Perhaps a family member can help you reduce your photo size of the files. You also have the option of having an onsite diagnosis by a certified arborist regarding the health of your tree.
Cherry trees can be susceptible to cherry shot hole fungus and brown rot, both fungal diseases.
Cherry shot hole - You may notice yellow leaves with reddish brown spots. The fungus overwinters on fallen leaves, and good control can be achieved by raking and removing all cherry leaves from the planting area. No chemical control is recommended.

Brown rot - The last several years we have been getting reports of a fungal disease on ornamental cherries especially Kwanzan called brown rot. This can occur in the spring during wet weather. Leaves on infected shoots turn brown and wither, but remain attached. Was the foliage brown during the spring and summer? See the attached link on brown rot

The leaves just started turning 10 days ago.

Without a photo we cannot be sure of what you are referring to. You mentioned the branches were rotting. Branch dieback can be due to possible borers or fungus. You will have to look for this. Look along the trunk or branches for sawdust, sap, holes, or dead sunken wood. If in branches, all you can do is prune back to healthy wood. If the main trunk is affected. All you can do is keep the tree well watered during dry periods. See the attached link

If the branches and trunk look fine, then you may be dealing with a leaf spot disease. All you can do is rake fallen leaves to prevent overwintering spores. No chemical control is recommended.