North Central Research Station

The issue

Oak wilt, caused by the native fungus, Ceratocystis fagacearum, is one of the most serious diseases of oaks (Quercus) in the Midwest and kills thousands of oak trees every year. The disease causes clogged water conducting vessels, leading to wilt and death of infected trees. Red oaks are more susceptible than white oaks and can die within a few weeks. Spread of the disease occurs both above and below the ground. New infection centers are created when certain species of beetles pick up fungal spores from infected trees and carry them to healthy trees. If these beetles land on fresh wounds (e.g., from storms or pruning), the tree will likely become infected. Belowground spread occurs when the fungus grows from infected trees to healthy trees through grafted roots.

What are we doing about it?

We are conducting several studies to learn more about the insect vectors and overland transmission of oak wilt disease.

We are studying the chemical treatments and belowground spread, specifically the fungicide, propiconazole, to learn more about its ability to prevent the spread of oak wilt disease in red oaks.

We are working to control oak wilt by integrated disease management strategies.

Research products

Juzwik, Jennifer. 2000. An oak wilt primer

Juzwik, J.; Cook, S.; Haugen, L.; Elwell, J. 2004.  GTR-NC-240.  Oak wilt: people and trees, a community approach to management. Version 1.3.