Madison, WI – Wisconsin residents are being urged to avoid pruning or damaging oak trees this spring as the risk of a deadly tree disease increases significantly.
According to the Wisconsin Department of Natural Resources, the period from now through mid-July marks the highest risk window for oak wilt, a fungal disease that can quickly kill infected trees. Even minor damage to oak bark during this time can expose fresh wood, attracting beetles that spread the disease.
Officials say the fungus responsible for oak wilt attaches to beetles after they feed on infected trees. When those beetles are drawn to fresh wounds on healthy oaks, they can transmit the disease, leading to rapid infection.
Red oak species are particularly vulnerable, often dying within weeks of infection. White oaks may survive longer but can still succumb over time. Early signs include leaves turning a bronze or shiny color before falling prematurely.
The disease can also spread underground through interconnected root systems, allowing it to move between nearby trees in forested areas or residential properties.
State officials emphasize that prevention is the most effective strategy. Avoiding pruning and protecting trees from damage during high-risk months can help reduce the spread and preserve tree health.
Residents concerned about oak wilt are encouraged to consult forestry experts or the Wisconsin DNR for guidance.
