Warm-season grass
Zoysia Grass: Grubs
Worried about grubs on your Zoysia grass lawn? Spongy turf that lifts like carpet — and how to confirm it. This guide takes the general diagnosis and tunes it for Zoysia grass — the signs to look for, what to do first, and how a warm-season lawn recovers — kept safety-first, with the product label as the final word.
What this means for Zoysia grass
Zoysia grass is a warm-season grass at its peak in summer, so when it browns or thins the cause is usually a specific pest, disease, or drought — not the grass simply giving out. That makes identifying the culprit the whole game: fix the actual cause and a healthy stand normally bounces back.
How to tell on a Zoysia grass lawn
- Irregular brown patches that feel spongy underfoot because the roots are severed.
- Turf that peels or rolls back easily, with no anchoring roots underneath.
- Skunks, raccoons, or birds digging up the lawn at night to eat the larvae.
- White, C-shaped larvae in the top inch or two of soil when you peel back a patch.
What to do
- Step 1
Cut a flap and count
Peel back a one-foot square of turf at the edge of a damaged patch and count the white, C-shaped grubs. A few are normal and harmless; control is generally only warranted when counts run high (often cited around 8–10+ per square foot for many grasses).
- Step 2
Support recovery first
A healthy, well-watered lawn outgrows light grub feeding. Keep it watered and mowed high so it can repair the root damage on its own where counts are low.
- Step 3
Treat only a confirmed infestation
If the count is genuinely high, choose a product labeled for grubs and match it to the timing on the label (curative vs. preventive products work at different life stages). Reseed killed patches in the fall.
Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.
How Zoysia grass recovers
Zoysia grass spreads and self-repairs, so once the cause is handled, small thinned or damaged areas usually fill back in on their own with steady watering and time — you rarely need to reseed.
Safety first on Zoysia grass
Resist the urge to push zoysia with extra nitrogen — excess feeding drives thatch, not color. Keep any single feeding at or below ~1 lb of nitrogen per 1,000 sq ft. Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.
Preventing it next season
A deep-rooted, properly watered lawn tolerates grubs far better than a stressed one. Where grubs are a yearly problem, a preventive product applied at the labeled time is more effective than chasing damage later.