Myth Demystified
Is a Dying Lawn Patch Chinch Bug Damage or Drought Stress
Demystified By
Expert Name: Terri Billeisen
Expert's Take
It absolutely depends on turfgrass species and location – chinch bug damage is usually situationally-specific.
If it is St. Augustinegrass in the southeastern US during the months of July and August, it very likely could be chinch bug damage.
The best way to confirm is to visually inspect the turfgrass, parting it with your hands to examine the soil surface. Chinch bugs are very active and quick-moving so you will see most life stages crawling around. Middle of the day is best, as they love hot and dry weather.
One thing to note, populations noticeably increase when conditions are dry as chinch bug populations are generally suppressed by soil microorganisms where there is adequate soil moisture.
Drought stress can occur in all turfgrass species when it has been hot and dry for a long period.
MFY Notes
Terri’s answer is a good reminder that pest diagnosis isn’t one-size-fits-all: this chinch bug scenario is really tied to St. Augustinegrass, a specific region, and a specific stretch of the calendar, not a universal lawn problem. It’s also a good example of how much soil itself drives what you’re seeing above ground — chinch bug outbreaks and drought stress are both, in their own way, downstream of how dry your soil gets and how well it holds onto moisture in the first place. If that’s your grass, our St. Augustinegrass page goes deeper into what it needs and where it tends to run into trouble, and our Soil Condition Hub and Soil Texture Hub can help you understand what’s actually happening underneath before you blame a bug.