I went on a consult the other day and the guy had a sugar maple with some normal looking borer holes (about 1/8") but then there were some large holes I would say about 3/8" to 7/16" with some large piles of frass outside them. They were concentrated around the crotch of the tree about 6' high. Anyone seen these before?
edit: The homeowner said that it had the small borer holes last year but these large holes just appeared this summer.
edit: The homeowner said that it had the small borer holes last year but these large holes just appeared this summer.