It's true that the curcurbit in the pumpkin seeds paralyzes the worm and they can expell it. It is more of a preventative type than something for a bad infestation, sort of keeps the worm load from becoming a health risk for the bird. I always made soupy oatmeal, cooled it down with buttermilk and put chopped pumpkin seeds in it. They made it disappear in about 5 seconds flat. Now, the seeds are so expensive, as is the buttermilk, I rarely do it anymore.