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.
People think that if the directions call for so much, more is better.
That's not so. Vedaee recommends a heavy soaking of the edges of the infested circle, where the insects feed. The treatment should be repeated two to three times every seven to 10 days, he said. The smaller the circle, the less chemicals needed. Those include ladybugs, which feed on chinch bugs.