Trunk injections of imidacloprid or emamectin benzoate for emerald ash borer

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

Valuable trees can be protected with trunk injections of imidacloprid or emamectin benzoate made by tree care professionals. Research tests with Merit Tree Injection (imidacloprid), ImaJet (Arborjet imidacloprid), and Tree-Äge (emamectin benzoate) have shown excellent results over a three-year period. Ash trees should be injected in late May or June (bidrin can be also be injected in July and early August) to prevent injury this year. Trunk injections made later in the summer or early fall may provide protection the following year. Below is a table of the products available for trunk injection and the suggested frequency of treatment on the product label.

Note: This information is for educational purposes only. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.

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