St. Augustine Chinch Bug Control
Chinch bugs are the #1 pest threat to St. Augustine and can destroy an entire lawn in weeks. They suck plant juices from stolons and inject a toxin that blocks water transport. Signs: irregular yellow-brown patches that expand outward from sunny, hot, drought-stressed areas — damage looks like drought but does not recover with watering. Confirm with the float test: cut both ends off a coffee can, push into the lawn edge of a damaged area, fill with water, and watch for tiny black-and-white bugs floating up within 10 minutes. Treatment: bifenthrin granules or liquid at label rate, water in lightly. Prevention: proper irrigation (stressed lawns are most vulnerable), avoid excess nitrogen, and maintain thick turf through correct mowing height.
Frequently Asked Questions
How do I know if I have chinch bugs?
Look for irregular yellow-brown patches that expand rapidly, especially in sunny areas near driveways and sidewalks. Do a float test: cut both ends off a coffee can, press it into the soil, fill with water. Chinch bugs float to the surface within 5 minutes.
When are chinch bugs most active?
June through September during hot, dry weather. They thrive in full sun areas and often start near heat-reflecting surfaces like driveways and sidewalks.
How do I treat chinch bugs?
Apply bifenthrin (Bifen IT) at label rate, watering it in lightly. Treat the entire affected area plus a 5-foot buffer zone. A second application 2-3 weeks later ensures kill of newly hatched nymphs.
Can I prevent chinch bugs?
Proper irrigation is the best prevention — chinch bugs prefer drought-stressed lawns. Avoid over-fertilizing with nitrogen, which produces succulent growth that chinch bugs prefer.
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