Armyworms Are Attacking Lawns

Here’s What to Do NOW! Fast Action Guide for Homeowners Dealing with Armyworms

🐛 What Are Armyworms?

Armyworms are caterpillars (larvae of moths) that travel in groups and feed aggressively on grass. They’re about 1–1.5″ long with stripes and an upside-down “Y” on their heads.

Why they’re a threat:
They can destroy an entire lawn in just 24–48 hours if left untreated.

⚠️ Signs You May Have Armyworms

✔ Sudden brown or dead-looking patches in the grass
✔ Grass blades look chewed or ragged
✔ Birds flocking to your yard in large numbers
✔ You see caterpillars crawling on sidewalks or driveways
✔ You can spot “waves” of damage spreading daily

✅ What To Do Right Now

1. Mow Your Lawn:
Cut and bag clippings—this removes some worms and allows treatments to work better.

2. Water Deeply:
Moisture can help bring worms to the surface and relieve stress on the grass roots.

3. Apply Insecticide:
Use a lawn-safe product with Bifenthrin, Permethrin, Carbaryl, or organic options like Spinosad or Bt.

Best time to spray: Late afternoon or evening

Reapply if needed after rain

4. Call a Lawn Professional (Optional):
If infestation is heavy or widespread, professionals can treat it quickly and safely.

🌱 What to Expect After Treatment

Caterpillars may still be visible for 1–2 days.

Damaged grass may look worse before it recovers.

Healthy lawns often bounce back in 2–3 weeks with proper care.

🛡 How to Prevent Future Attacks

Mow regularly (but avoid cutting too short)

Dethatch if needed

Fertilize to strengthen grass

Check for signs again in late summer & early fall

🏡 Don’t Let Armyworms Win!

Your lawn can recover—and even thrive—with the right care and quick action.
If you’re unsure what to do next, contact a trusted lawn care provider for help.