Squash Bug

Yellow spots on the leaves of your pumpkins, winter squash, or summer squash are one sign of squash bugs. Another is wilting vines, or vines that wither and turn black. It can be a bit confusing, because the symptoms (wilting vines) are easily confused with that of squash vine borer (below). One good way to determine the difference is to look for dusty looking frass (dropping) on the stems -- that's usually an indicator of vine borer rather than squash bugs.