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I did find this information about spraying your trees (nothing about spraying firewood):
Homeowners also have the option of spraying small trees themselves with Bayer Multi-Insect Killer, containing cyfluthrin (the same active ingredient that is in Tempo). Now is also a good time for trunk injections with imidacloprid (Pointer, Imicide, Ima-jet). Trunk injections made last year in late May with imidacloprid worked well. We also know that bidrin trunk injections worked well in late May, July, and August. There is still time to treat ash trees this year to protect them from emerald ash borer attack this summer, but don't wait much longer if that is what you want to do.
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