Update on professional products for control of emerald ash borer on individual trees

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.

On-going research tests at Michigan State University by Dave Smitley and Deb McCullough and at Ohio State University by D. Herms, on the long-term protection of ash trees from emerald ash borer have produced some new results that may be of interest to tree care professionals:

  • TREEäge trunk injections have given two to three years of nearly 100 percent protection following a single treatment. These tests are still in progress, so the length of protection could be even longer.
  • A single basal drench or basal soil injection per year of Merit or Xytect has been highly successful for protecting small ash trees (less than 12 inches dbh), while larger trees (greater than 15 inches dbh) will need two applications per year. Trees greater than 25 inches dbh have not yet been tested.

A new regional extension bulletin has been drafted by Herms, McCullough, Smitley, Sadof, Williamson and Nixon, that will include a complete list of insecticide products that have been tested for control of EAB and how they can be used to protect ash trees. This bulletin should be ready later in May. I will let you know in the Landscape Alert as soon as it is available and how to find it.

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