What causes my oak died really fast — is it oak wilt??
Bretziella fagacearum, moving by two routes with different implications. Underground, naturally grafted roots between nearby same-group oaks carry it tree to tree, producing expanding pockets of dead oaks. Above ground, sap-feeding nitidulid beetles pick up spores from fungal mats on dead red oaks and carry them to fresh wounds, which is how spring pruning cuts and construction damage start brand-new infection centers. Oak wilt occurs in Indiana; whether it is confirmed in any specific central Indiana county is UNVERIFIED here and should be checked with the state rather than assumed either way.
What you'd see
On red oak group members (pin, red, black, scarlet — pointed, bristle-tipped lobes), leaves bronze or brown from the tip and outer margin inward while the base stays green, then drop heavily in midsummer while still partly green. A crown can go from normal to bare in a few weeks, usually starting at the top. On white oak group members (white, bur, swamp white — rounded lobes), the same infection shows as scattered branch flagging spread across several seasons. Sometimes dark streaking in the sapwood beneath the bark of a wilted branch.
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