We've never seen anything like this before. It isn't a "problem", it's a plague!
Last year we only dealt with the squash bugs, and contrary to what we read, they will indeed happily eat watermelon and cucumbers as well as the squash. I heard to dust with whole wheat flour, and this year we are doing much much better with the bugs. They are still a major pest, but not a plague.
Now it is the SVB. Again, contrary to what we've read, these little devils (as Dave called them) are happy to eat right through our butternut squash. Also, despite these plants being set out the last week in June, they are still being devastated.
Fortunately, we still have enough time to try again for the season. It does make me wonder why this old cow pasture that hasn't had anything else ever grown on it has been plagued so badly.