I think I read on this forum recently about an organic insecticide that is widely used and is very effective for squash vine borers. The post said the product is used by organic gardeners because it is a natural insecticide made from a common soil bacteria. I can't locate the post with a forum search. The post said the product was also harmful to bees, but if it is sprayed in the evening and allowed to dry overnight, it will not hurt the bees; and will remain effective against squash vine borer beetles and larvae for about three weeks.
Does anyone else remember the post and possibly the name of the product?