Squash vine borers - there are a couple of things you can do to help protect your pumpkins against them.
They are laid by moths at the base of the plants. You can create collars of toilet paper tubes or paper towel tubes. You need to extend these about an inch below the soil as well as above (you can put the collars right at the soil level, then hill up the soil a bit instead of digging down below the surface, which does the same thing), and wrap them so the ends overlap (as the vine gets thicker, it will allow for it to expand.
You can also tie panty hose or cloth strips around the vine from the base of the plant to 6" above to prevent the newly hatched vine borers from being able to reach the vine. Panty hose will expand as the vine grows, so it is preferred.
One thing I always do is plant radishes around the pumpkins. Icicle works best, but any kind will help, as these do repel the squash vine borer moth. If you plant in hills, then plant 3 pumpkin seeds per hill, with a radish seed inbetween each as well as one in the center of the hill. If you plant in rows, then plant a radish on either side, a few inches away from each pumpkin seed. Don't pull the radishes! Let them go to seed. The bigger they get, the stronger they repel the moths.
If you do get squash vine borers in your vines (you can usually see the hole at the base of the plant, as well as some droppings around the hole), then you can sometimes successfully cut out the worm. Slit the vine from the base towards the end until you find the borer. Remove it and kill it. Then bind the slit vine with cloth and cover the vine with dirt until you are past the point where you found the borer. Burying the vine allows it to better form new roots past the destroyed part in order to feed the plant. It's worth trying, as you don't have anything to lose.
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