What chinch bugs do
Chinch bugs are tiny insects that feed on St. Augustine grass, sucking the moisture out of the blades. Damage shows up as yellow patches that turn brown and spread outward — almost always starting in the hottest, sunniest spots, like along driveways and sidewalks. Left alone, they can kill large sections of a lawn in a single summer.
How to check your lawn
Kneel at the edge of a yellowing patch and pull the grass apart down to the soil. Chinch bugs are small — adults are black with white wings, about the size of a pinhead — but you can see them crawling in the thatch if you look closely. They are most active in hot, dry weather. Damage that starts near pavement and spreads is the classic sign.
What stops them
Chinch bugs need a targeted insecticide applied to the whole lawn, not just the brown spots — by the time you see damage, the bugs have spread beyond it. A second application a couple of weeks later catches the newly hatched ones. After treatment, the lawn needs water and time to fill back in; dead patches with no roots left need re-sodding.
Keeping them from coming back
Healthy lawns fight chinch bugs better. Cut St. Augustine tall to shade the soil, avoid heavy summer nitrogen that makes grass tender and tasty to pests, and water deeply so roots grow strong. Lawns on a regular pest-watch schedule get treated at the first sign — before patches spread. Call (301) 679-9193 or send the form for a free quote — no pressure, no obligation.