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Borer Hole in Young Oak: Insecticide and No Sealant

Treat the Insect, Let Wound Heal

6-year-old oak with ½" angled hole 2 ft up = borer. Spray borer insecticide (e.g., Onyx) into hole. Do not seal—wound heals faster open. Tree appears healthy otherwise.

Trees: Oak Trunk Green/White Growth: Lichens, Not Disease; Water Oak Borer Damage: Insecticide Treatment and Tree Health; "Columnar Oak" Isn't a Bush: Why Your Tree Looks Like a Stick; Why Is My Mature Oak Not Producing Acorns?; Large Oak Cavity with Standing Water: Drain & Foam, Don't Cement; Borer and Decay in Old Oak Trunk; Hole in Ancient Oak's Crotch: Leave It Alone; Hollow Oak Tree: Decay Fungus ≠ Death Sentence; Managing Carpenter Ants in Oak Trees: What You Need to Know; Oak with Old Pruning Wound and Insects

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