RE: "I don't even know if the SVB is an active pest this time of year" I think not. I can never grow summer squashes (either here or when I was in Cincinnati) because of the vine borers. I had given up. But I planted a yellow summer squash at the end of July. I deliberately didn't even try treating it with anything. So far it has ten squashes on it and no sign of vine borer yet.
I'm really hopeful that this turns out to be a way I can grow zucchini and other summer squashes!