Ash tree problem

Asked June 19, 2015, 2:34 PM EDT

Here is a picture of one of our ash trees. The growth is on the lower trunk of the tree. Please advise as to what this is and as to what/how we can treat the tree with. The tree is fairly healthy looking, but does have several dead branches within the tree that we have been pruning each year. Thanks, Grace

Minnehaha County South Dakota trees and shrubs ash trees tree diseases

1 Response

Dear Grace,

Thanks for contacting us. From your photo it appears your tree may be suffering from ash canker (Pseudomonas savastanoi pv. fraxini), a bacterial infection which does not usually have any serious impact on the tree. Here is a fact sheet that provides details:
http://www.plantwise.org/KnowledgeBank/Datasheet.aspx?dsid=45003

If this is an important landscape tree for you, I suggest you consult with a certified arborist about it. Ash are being severely affected by the Emerald Ash Borer. There is no cure and trees generally die within 3 years of being infected. However, there are some preventative treatments that have proven to be quite effective. These product are injected into the base of the trunk and lasts about 2 years. Treatments should continued until the borer passes through the area. These treatments can only be applied by certified arborists.