Kerry E. Wininger, University of California Cooperative Extension Sonoma County Approximately 50 million trees had died from sudden oak death (SOD) in 2019, with ~200 million infected in California, ...

Oak wilt is spread by the movement of infected firewood. You can click here to learn more about oak wilt in Michigan. You can report sightings to the DNR at DNR-FRD-Forest-Health@michigan.gov or ...

Oak wilt disease can be particularly deadly for red oaks. ... Symptoms include leaves wilting and falling off, dark rings inside infected branches, and sometimes fungal mats under the bark.

Another way to nail down an oak-wilt diagnosis is to look for dark streaks in the wood underneath the bark. Calvin Norman/Penn State. A third diagnostic tool is slicing into a section of dead branch.

Verify oak wilt with the help of Michigan State University’s Diagnostic Clinic. Find instructions online or call 517-355-4536. Get help from an oak-wilt qualified specialist. Learn more about ...

"This study introduces a novel approach that simplifies and speeds up the diagnosis of oak wilt, potentially transforming disease management practices for this serious threat to oak tree health in ...

More information: Vinni Thekkudan Novi et al, A rapid LAMP assay for the diagnosis of oak wilt with the naked eye, Plant Methods (2024). DOI: 10.1186/s13007-024-01254-8.

For oak wilt testing, collect four to six branch sections that are about 8-12 inches long, roughly 0.5-1.5-inch in diameter and alive but showing symptoms of leaf wilt. Keep the samples cool, but ...

For Oak Wilt testing, 4-6 branch sections (each 8 to 12 inches long and approximately 0.5 to 1.5 inches in diameter) showing symptoms of leaf wilt should be collected.

If you see one of these Lindgren flight traps while you’re out hiking, you’re asked to leave it alone. The traps contain non-toxic materials used to collect beetles. These beetles are helping ...

Early detection of oak wilt, and distinguishing it from drought stress symptoms, is key to protecting these trees. Once afflicted by oak wilt, it’s nearly impossible to save oaks.

Laboratory confirmation is required for an accurate oak wilt diagnosis, but homeowners can watch for early signs, such as a thinning canopy or a distinctive pattern on the leaves.