Re: deterring the worms, which I'm familiar with by the name "corn borers" - Sounds reasonably good in theory, but since the moth they turn into lays its eggs directly on the silk of the new cobs, I doubt there's much benefit from the squash-stickers. The beans make good sense, though - they're nitrogen fixers, and corn is ungodly nitrogen-hungry, so I can't see any way the idea could hurt at all. Just went looking for "three sisters planting", and the one I clicked on from the results seems to be saying that the squash primarily intended to be a shade/cover crop to help with soil water retention, and as a bonus, produces useful fruits. Makes sense - if they don't do the "daily wilt" thing that I've seen being pretty much the norm here in this area - On the hot, sunny days, between about 3 and 6PM, give or take an hour, unless we run the sprinkler on 'em, squash and pumpkins wilt so bad it looks like somebody came through with a flamethrower and "lightly toasted" them. After about 6 or so, when the heat of the day has passed, they start to come back, and by morning, they're good as new, but then about 203, they start wilting again. First time I saw it for myself, I was sure the entire crop was dead, the wilt was so bad.