NW Illinois: Two wild cherries had wood borers (injected by arborist). Ash borer spreading regionally (not in county yet). Young maples/ash planted nearby. Protect them? Cherry borer = ash borer?
Ash borer ≠ cherry borer. Most borers are species-specific. Cherry borers won't attack maples/ash.
Merit or Onyx trunk spray prevents borer attack for 3–4 months. Generally not recommended unless signs appear (frass). If worried, spray nearby trees. Consult arborist.
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