curly willow tree borders.
I first noticed bark coming off this summer then later saw dust.By close observation this fall I see small bore holes. Can I treat it now in the fall. looks bad.
Baltimore County Maryland
If the bark is falling off, it's likely that the willow is in decline and the borers are secondary (not causing the dying.) But, we'd need to see photos to give a diagnosis. You can attach them to a reply.
You cannot treat now.