How to test your lawn for grubs and what to do if you find them
Summary
Grubs are young beetle larvae that can damage lawns by eating roots, causing brown patches. Homeowners should check for grubs by digging a small section of lawn and only treat the area if more than 10 grubs per square foot are found. Natural treatments like milky spore powder and beneficial nematodes work best in late summer, while chemical treatments may harm the environment.Key Facts
- Grubs are white larvae of beetles like Japanese beetles and European chafers.
- They live close to the soil surface and eat grass roots, which can kill lawns.
- To check for grubs, dig a 3-4 inch deep, 12 inch square patch where the grass is unhealthy.
- Fewer than 10 grubs per square foot is normal and doesn’t need treatment.
- Treatment should be done in late summer when grubs are young and most vulnerable.
- Milky spore powder targets Japanese beetle grubs but is less effective in cooler areas.
- Beneficial nematodes are natural microscopic worms that kill grubs quickly and work on all grub types.
- Avoid chemical pesticides as they can harm earthworms, bees, pets, and wildlife.
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