Ash blight

Asked May 13, 2015, 3:43 PM EDT

Got a mature ash tree with the "blight." Losing leaves now. Second year. Looks like lower branches only. Otherwise healthy, full sun. Apply lime and 10-10-10 fertilizer spring and fall on grass around. Anything to do at this point, or do I wait until next year to treat the problem?

District of Columbia County District of Columbia trees and shrubs ash trees

3 Responses

We are not sure what you mean when you say that your tree has ash blight. There are numerous diseases and insects that ashes can get. http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/ash-diseases You might want to get a certified arborist to evaluate your tree. Another possibility would be to send us photos. Be sure to send at least one of a close up of a branch with affected leaves. vw

Attached are leaves that seem to have come from the lower branches of the tree. You can see that the lower branch in one of the photos is missing maybe half its leaves. Otherwise, the tree is healthy. What to do? Something now or something prior to next spring? Thanks for your help.

This looks like ash anthracnose. It is so dry now, that you do not need to do anything other than rake up the fallen leaves. http://extension.umd.edu/hgic/shade-tree-anthracnose-trees Your tree could have this problem in coming years, but it is a problem that your ash will be able to live with. The only problem is that you will probably have to rake leaves more often. vw