Ambrosia beetle treatment #560516 - Ask Extension


Ambrosia beetle treatment #560516

Asked May 11, 2019, 10:46 PM EDT

A nurseryman has suggested that I continue with annual spray treatments for my large white oat trees. They were sprayed last year for the first time. Is this a reccomended or necessary spray schedule for my area?

Harford County Maryland

Expert Response

We are not aware of white oak trees being affected by ambrosia beetles. These insects prefer thin-barked trees and especially trees that are stressed. How did the nurseryman diagnose the problem? What signs and symptoms did they see on your tree?

Ambrosia beetles have three generations per year and their activity is tied to the weather and moisture. We are now at the end of the first generation. The second and third generations may not be a big problem if we get into a drier weather pattern.

Here is information about ambrosia beetles in the home landscape.
This is information for nurserymen:

One of our entomologists tracks ambrosia beetle activity to determine the appropriate times when treatments will be effective. This information is provided in our landscape IPM reports, which we encourage nurserymen/landscapers to use. Once the beetles are enclosed into their tunnels in trees, spray applications are ineffective, so timing is critical.


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