How long can I leave i think my ash tree has that beetle before it becomes dangerous?
Treat-or-remove is a decision measured in one or two growing seasons, not days. The dangerous clock starts after death. Dead ash deteriorate unusually fast and turn brittle — limbs shed without warning and the wood fails under a climber's weight, which is why crews will not climb a dead ash. A standing dead ash near a house, driveway, or play area is a different conversation from a live infested one and should not be left through another winter.
Whether it can still be saved
Yes, if caught early and committed to permanently. The standard is a trunk-injected systemic — emamectin benzoate has the strongest track record — applied by a licensed applicator and repeated roughly every two to three years for the life of the tree. Extension guidance commonly puts the practical cutoff somewhere under 30 to 50 percent canopy loss; past that, the tissue that would carry the insecticide is too damaged and treatment fails (the exact percentage varies between sources — UNVERIFIED as a single agreed number). Soil drenches and homeowner products are markedly weaker. Honestly framed, treatment is an indefinite subscription: worth it for a large, healthy, well-placed shade tree, rarely worth it for a marginal one.
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