And as the water goes down, add more. If the infestation is heavy, the insects should abandon ship almost immediately and rise to the surface. But wait about five, six minutes. If they surface, take a close look. Young chinch bugs, or nymphs, are a combination of clearish white and red, and are easiest to identify because of the coloring.
Adults have white wings and a black head, with no red markings.
If no bugs materialize, try two or three more spots around the circle, Vedaee said. A small white beetle grub, which might also surface, also loves grass - and probably is the culprit if the chinch bug isn't. The chemicals commonly used to kill both the chinch and the grub are called Diazanon and Dursban. Both are inexpensive and are available at most department or hardware stores. The chemicals are mixed with water and sprayed on the grass.