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Lawn Grubs: How to Identify, Treat, and Prevent Them for a Healthy Lawn

by Gregory
3 minutes read

Lawn Grubs: How to Identify, Treat, and Prevent Them

What are Lawn Grubs?

Lawn grubs are the larvae of various beetle species, including Japanese beetles. They live in the soil and feed on grass roots, which can cause brown patches and damage to your lawn.

How to Identify Lawn Grubs

To determine if you have lawn grubs, look for the following signs:

  • Irregular brown patches of lawn that peel away easily from the soil
  • Visible grubs in the soil when you dig up small sections of lawn
  • More than five grubs per 1/4 square foot of lawn

When to Apply Grub Worm Treatment

The best time to treat lawn grubs is in late summer or early fall, while the grubs are still small and close to the surface. Insecticides are less effective in the spring when the grubs are larger and no longer feeding.

Types of Insecticides for Lawn Grubs

  • Dylox: Most effective and fast-acting insecticide for fall treatment
  • Merit and Mach-2: Preventative insecticides that target pests before they lay eggs

Natural Grub Treatment Options

If you prefer a more natural approach, consider the following options:

  • Milky spore: A disease that infects and kills lawn grubs
  • Neem oil: A botanical pesticide that repels Japanese beetles and lawn grubs
  • Beneficial nematodes: Microscopic worms that release bacteria into the soil, killing lawn grubs

Preventing Lawn Grubs

To prevent lawn grubs, follow these tips:

  • Keep your lawn healthy and well-maintained, as lush grass is less susceptible to damage.
  • Avoid overwatering, as moist soil attracts grubs.
  • Remove thatch and other organic debris from your lawn, as these provide hiding places for grubs.
  • Apply preventative insecticides, such as Merit or Mach-2, in the spring before grubs hatch.

Additional Tips

  • Choose the right insecticide for your needs. Consider the severity of the infestation, the type of grubs you have, and your budget.
  • Follow the instructions carefully. Insecticides can be harmful if not used properly.
  • Water your lawn deeply after applying insecticides. This helps the chemicals penetrate the soil and reach the grubs.
  • Be patient. It may take several weeks to see results from grub worm treatment.


By following these tips, you can effectively identify, treat, and prevent lawn grubs, ensuring a healthy and thriving lawn.

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