Squash bugs are very common throughout the United States, and they are known for causing havoc in gardens. They will feast on squash, pumpkins, and even cucumbers by sucking the sap right out of them with their sharp, sucking mouthparts. They inject toxin with every bite, so it will ruin the plants they are eating very quickly and since their damage stops the flow of nutrients through the plants it will be noticeable because the leaves will wilt and dry up.
Squash bugs are normally about half an inch to an inch long and have a grayish brown body. While they can fly you will most likely see them walking around on the plants themselves. Squash bugs can be very hard to get rid of on your own, but since they only produce a new generation about once a year there are many steps you can take to make an infestation manageable.