April 5, 2021

Oak wilt has been identified in upstate NY, in Bristol along Canandaigua Lake. This is a particularly devastating disease, especially for Red Oak varieties. The fungal pathogen is spread by insects that bore into trees. After being introduced to a healthy tree, it attacks the tree's vascular system. This process is similar to what we saw with Dutch Elm Disease many years ago. Red Oaks wilt within one season of infection, and is always fatal. White Oaks can live with the disease for several years, and can be fatal as well.

To prevent infection do not prune Oaks during the growing season. Avoid any unnecessary cuts and mechanical injury. If any wounding of live wood occurs, seal the wound if possible. Trees can also transmit from one another through root contact. Infected trees are to be removed and destroyed in cooperation with the NYSDEC forestry division. If you suspect Oak Wilt please contact your local DEC forester. 

Chemical controls are available for Oak Wilt prevention in all Oak species. Therapeutic treatments may be advised in White Oaks. Please contact our Certified Arborists for a consultation. 

Ten oak leaves with brown spots are arranged in two rows on a blue background.

Red Oak Wilt

Oak leaves with brown, dying areas starting from the tips, showing signs of disease.

White Oak Wilt