First, determine if your ash tree is worth treating. If your ash tree is in decline and already exhibiting more than 50% canopy loss, then the tree is likely too far gone. Similarly, treatment of small ash trees is not recommended since you must treat your ash tree every 1 to 3 years. You may be able to replace your tree with a higher quality tree for a lower cost than long-term treatment.
If you decide to treat your tree, hire a tree company that uses a chemical injection. We recommend using emamectin benzoate, a chemical that is injected into the trunks of ash trees by a certified pesticide applicator. Injections are the most effective method of treating the tree and cause the lowest risk to the environment. The soil-applied drench chemical imidacloprid is not recommended, due to water quality implications and its impacts on pollinators.Download a EAB Treatment Guide