Chinch bugs are parasitic insects that feed off of and eventually kill plant life. They are very small and, left untreated, can cause a lot of damage to a lawn. However, if the appropriate precautions are taken, chinch bugs can be managed and the damage they cause can be minimal. Chinch bug is a general term used to refer to three different species within the Lygaeidae family. They have piercing-sucking mouthparts and feed on the sap of grass plants. The chinch bug can be a major insect pest on home lawns throughout the country.