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Now is the time to treat trees against emerald ash borer...

Prime time to treat trees against EAB

Now is the time to treat trees against emerald ash borer via tree trunk injections. If infested trees are left untreated, the larvae will be at their largest and most voracious from August through October. During that timeframe they will feed heartily under the bark and cause S-shaped grooves that will eventually kill the ash trees they have infested.


Emerald ash borer is creating havoc in many areas of the United States including Michigan, Illinois, Indiana, Kentucky, Maryland, Minnesota, Missouri, New York, Ohio, Pennsylvania, West Virginia and Wisconsin. Thankfully, tree trunk injections are a proven and cost-effective treatment that will save treasured ash trees from its attack. By injecting targeted insecticides directly into a tree’s vascular system, the application quickly begins protecting the tree from insects that feed on the leaves and under the bark. The duration of treatments vary depending on the insecticide used. For example, one Arborjet EPA-approved insecticide controls emerald ash borer for two years with a single application.


“Emerald ash borer larvae will cause irreparable damage to infested trees if they are not treated before August,” said Russ Davis, president of Arborjet. “This is an important consideration at this time of year due to the short window available to protect ash trees from the heavy fall feeding of the insect.”

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