Oak wilt

Asked March 1, 2019, 8:51 PM EST

I had an oak trimmed this winter, 8inch to about 12inch diameter cuts. The tree trimmers said that the cuts did not need prune seal? This is a good size red or pin oak in kalamazoo county. Is this true?? I find it difficult to believe that the sap won’t run out of such large multiple cuts? Any advice would be very helpful and hopefully this can be resolved before the sap starts to run. Thank you Lee Taylor

Kalamazoo County Michigan

1 Response


The recommendation is to use pruning paint only when it is absolutely necessary to prune oak trees during the active growing season. So, pruning cuts on oaks during the winter do not need to be sealed; the beetles which vector oak wilt are not active during the winter and the trees will seal the cuts before those pests become active. You may find the information in this article helpful: https://www.canr.msu.edu/news/prune_oaks_in_winter_to_avoid_oak_wilt