When I clicked on the thread, I had in my mind "It's gonna be either varroa or a bear." I think I can eliminate varroa on this one. Wait, to be sure - when did you test last? What is your treatment protocol? Did you test after?
Dan, my yard looked like that this weekend. Almost have it cleaned back up. Feeders, feeding shims, frames (good and bad), supers, empty boxes, lids, queen excluders, etc. It was all there and it was all over.
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