Squash Vine Borer

Your perfectly healthy zucchini or pumpkin has a withered vine here and there. Cut open the vine just about where the problem starts, and you'll probably find the grayish-white larva known as squash vine borer. The good news is that once you find them, you can halt the damage. Simply slice the vine open and dig the borer out. Then you can trim off any yellow or wilted parts of the stem, and bury the rest in the soil. It will grow new roots, and keep growing happily.