Frequently Asked Questions about Ash Trees and EAB Protection

Answers to Your EAB Questions

Our certified arborists are working hard every day to ensure that you are infromed of the options you have with any of your trees including ash. The emerald ash borer continues to make its way across Wisconsin and the midwest. 10-25% of the trees you see in southeast Wisconsin are ash trees. Due to the large population of this species in Wisconsin, many concerned ash tree caretakers frequently call us for more information on this aggressive insect and its effect on the ash tree in Wisconsin. We hope you use the information provided here to educate yourselves as well as others in your neighborhood and community. 

Q. I’ve seen bumper stickers and signs that say “Don’t move firewood, it BUGS me”.  What does that mean?
A. After Emerald Ash Borer has been verified in a specific location, that area is quarantined with the hopes of slowing the spread of EAB to unaffected areas. Moving firewood infested with EAB moves the destructive bug to these unaffected areas much quicker than naturally possible. All of Southeast Wisconsin is now quarantined.

Q. How do you treat my tree to protect it against the Emerald Ash Borer?
A. Soil Systemic Insecticide – Applied to the soil and absorbed through the root system. Research shows this method to be 80% effective.
A. Insecticide Trunk Injection – Injected around the diameter of the tree low on the trunk. Approximately one injection every 6 inches, depending on the overall size of the tree. Research shows this method to be 95% effective.

Q. When will you be treating my ash tree?
A. Timing is dependent on the weather and the treatment recommended by your arborist. The soil systemic insecticide treatment is done in spring while the insecticide trunk injection is done in Summer, typically starting the 3rd or 4th week of June and continuing through summer and into early fall, weather dependent. 

Q. You treated my ash last year with an insecticide trunk injection and it looks worse this year! Why?
A. If your tree was already infected prior to treatment, it may take a while for your tree’s health to be restored and for new growth to appear. While treatment will arrest any further damage done to your ash, your tree will still need time to recover. 

Q. What types of ash are susceptible to EAB?
A. All ash trees are susceptible to the Emerald Ash Borer. This includes the green, black, white, and blue ash trees. Despite its name, the mountain ash is not susceptible because it is not a true ash tree species. 

Contact our Certified Arborists today for more information on how to protect your ash trees from emerald ash borer in Wisconsin. 

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