What Are Chinch Bugs
Chinch bugs are tiny (1/6 inch) black and white insects that feed on grass blades by piercing the stems and sucking out plant fluids. They inject a toxin that blocks the grass’s water-conducting vessels, causing it to yellow, wilt, and die even with adequate watering. Damage appears during the hottest, driest periods of summer because heat stress makes the grass more vulnerable.
How to Identify Chinch Bug Damage
Chinch bug damage looks like drought stress that doesn’t respond to watering. Irregular yellow patches start at lawn edges (along driveways, sidewalks, and south-facing slopes where it’s hottest) and spread outward. The grass turns yellow, then brown, then dies. To confirm: push a coffee can with both ends removed into the soil at the edge of a damaged area, fill with water, and wait 10 minutes. Chinch bugs float to the surface.
