When to prune oak (oak wilt timing)
Midwinter dormant season (coldest months). Fresh wounds attract sap beetles that carry the oak wilt fungus. Infection risk is highest in spring and early summer. Prune in the dormant season, and seal or paint any unavoidable wound right away.
| Type | tree |
|---|---|
| Blooms on | n/a |
| Bloom season | spring |
| When to prune | Midwinter dormant season (coldest months) |
| Stop | No heavy pruning in the 6–8 weeks before your first fall frost |
Avoid
Texas: Feb 1–June 30 (Texas A&M Forest Service). Upper Midwest: April through July (UMN, UW). Elsewhere: spring and early summer.
Also
Red oaks are most susceptible. Hire a certified arborist for large limbs.
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Sources
- Texas A&M Forest Service: TexasOakWilt.org
- University of Minnesota Extension: Oak wilt in Minnesota
- University of Wisconsin-Madison Extension (Wisconsin Horticulture): Oak Wilt
- Clemson Cooperative Extension HGIC: Pruning Shrubs
Summarized in our own words from public extension publications.
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