Emerald Ash Borer infestation

Asked January 23, 2019, 12:46 PM EST

Our neighborhood has a significant infestation and your information paper said to report infestations. Our neighborhood is Paradise Hill located on Frederick Road, 21228. We would really like to save the trees.Could you recommend an arborist to treat the trees with insecticide? Thank You Woodrow

Baltimore County Maryland

3 Responses

Damage to ash trees from emerald ash borer is extensive now in Maryland, with the exception of a few places on the Eastern Shore. The best way to find a certified arborist is to use the "Find an Arborist" search on the website of the International Society of Arboriculture. https://www.treesaregood.org/

Ash trees become very brittle, quickly, when they are dead and they can become hazardous to people and property, so prompt removal is recommended. In ash trees that have less than 30% canopy dieback, there are options to treat the trees with a systemic insecticide, but the treatments will need to be repeated every 2-3 years for the remaining life of the tree.

When considering replacement trees, the Maryland Department of Natural Resources offers a coupon to help defray some of the cost of planting recommended trees. Here is the information about their program. http://dnr.maryland.gov/forests/Pages/MarylandersPlantTrees/Print-Your-Coupon.aspx


Thanks for your rapid response. We have been told that significant woodpecker damage (blonding) can reduce or nullify the effect of the insecticide. I have attached pictures of a couple of our trees with blonding. In your opinion are these trees too damaged for the insecticide to be effective? The woodpecker damage has occurred just in the past few months.

Also, Ms. Colleen Kenny has recommended injecting Emamectin benzoate into the trunk but at a cost of $20 per diameter inch which is significantly higher than the estimate in your homeowneres guide. She also says that the treatment is best applied in the spring. Are there any steps that we can take to slow the damage until then?

Once the trees are this far gone, it is too late and those trees should be removed if their eventual fall would threaten people or property.

It is expensive to treat and those treatments would multiply over time.