Although there are insects beneficial to lawn care, many are common pests, including: cinch bugs, fire ants, boxelder bugs, earwigs, grubs, and much more. Lawns are meant to sustain a certain number of insects. When infestations occur, problems arise. Every insect affects growing grass in a different way and some are more harmful than others. Often infestations cause grass to die, which means lawn repair is necessary for grass to grow again.