Green Ash Tree Disease

Asked May 8, 2017, 8:33 PM EDT

There is a Green Ash Tree located on the parking in front of my house in Le Mars at 18 3rd Ave SE. I noted that the leaves are blowing off and they are brown dot spotted and curling. This is an old tree. I also noted some type of flying insect that emerged from bored holes in the trunk. Please advise on what this might be.

Plymouth County Iowa

1 Response

There could be a number of things happening to your green ash. There are several insects or diseases that attack ash trees. I have included links to several resources to learn more about ash problems. The first one has great pictures of different problems of Ash trees (https://store.extension.iastate.edu/Product/Common-Problems-of-Ash-Trees) including Emerald Ash Borer.
Since Emerald Ash Borer is becoming more common across Iowa – I would recommend investigating the tree and bored holes more closely to see if they match those of EAB (https://hortnews.extension.iastate.edu/emerald-ash-borer or https://store.extension.iastate.edu/Product/EAB-or-Native-Borer). While I don’t think EAB has been confirmed in your area, if you think the symptoms match those of EAB, I would suggest contacting your district forester (listed below) for confirmation.
District 10
Joe Schwartz
1100A 12th Street SW
LeMars, IA 51031-3034
Phone: 712-546-5161
Joe.Schwartz@dnr.iowa.gov
Best,
Cynthia Haynes
Associate Professor
Department of Horticulture
515-294-4006
chaynes@iastate.edu