You rang, Sandi?
David, you're definitely right to question the logic of that line of thinking... pumpkins and squash need plenty of water to grow their fruit. The first flowers will usually be on a "stalk" and are the male flowers; the female flowers will have a tiny pumpkin at their base. Once the pumpkins are near the end of their growing season and are mature is the only time I can think of that might make sense to stop watering, although where I am they often get a lot of rain at that time and still seem to do fine.
I hope this is helpful, and that you have good success with your pumpkins!
