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Rhonda Ferree's ILRiverHort

Rhonda Ferree's Horticulture Blog

Emerald Ash Borer Frequently Asked Questions (FAQ)


Questions and Answers.
  1. Question. Should I do a preventative treatment on my ash tree, even though it doesn't have the pest yet? Answer. University of Illinois Extension recommends doing a preventative treatment for Emerald Ash Borer only when the beetle has been confirmed within 15 miles of your ash tree. Consult the latest quarantine map to know where the beetle has been found in Illinois. Click on "maps" in the lower right column.
  2. Question. Are all ash trees susceptible to the EAB? Answer. Yes, all trees in the genus Fraxinus are susceptible to the EAB. There are several different types of ash trees in the Fraxinus genus. There are also a few look-alikes or trees with ash in the name that are NOT actually ash trees. This publication gives more information to help determine if you really have an ash tree. Ash ID and EAB Symptom Checklist
  3. Question. Is my linden ash tree going to get EAB? Answer. I am not aware of a linden ash tree. My guess is that you are referring to two different trees and possibly two different pests. The linden tree is not an ash and thus does not get the EAB. However, linden is a favorite food for the Japanese beetle and might be confused since both beetles are often in the news in central Illinois. Japanese beetles do not bore in trees and most lindens will survive the beetle feeding. There are several different types of ash tree, including blue, pumpkin, white, and green. This website gives more information about ash trees UIPlants
  4. Question. I think I have the borer in my ash tree. Can you come out and take a look at it? Answer. University of Illinois Extension does not do plant visits. You should, however, report any suspected trees to the Illinois Department of Agriculture. Information on how to submit a sample is found at

Other Resources:

Illinois Department of Agriculture EAB website: Go here for the latest news on EAB in Illinois.



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