How to Treat a Lawn for Grubs


Grubs are actually just a stage of beetle life, and for lawns, the grub stage is the most destructive stage. Timing is important in controlling these pests. The beetles lay their eggs in summer, so making sure that your lawn is inhospitable at that time of year will go a long way towards preventing them. Keeping grubs out of your lawn once they have been established is difficult and takes some time.

Step 1

Ensure that you have grubs in your yard. Grubs can be found just below the surface. Dig up a corner of grass and lift it up to look for the culprits. If you seed them, count how many are in a square foot of lawn space. If there are five or fewer, then your lawn is okay, but check back often to make sure the numbers haven't increased.

Step 2

Purchase milky spore at a lawn care center. This is basically a disease that won't harm the grass but will infect the grubs when they eat the grass roots. Apply as directed. Your yard might need several applications at first, but once established, it will last for three to five years.

Step 3

Water the lawn less. If it can be sustained on less water, do it. The grubs cannot survive without water, so less is better. Also, adult beetles are more likely to lay their eggs on lawns that are moist.

Step 4

Apply an insecticide that states that it works on grubs. Water the lawn before you apply the insecticide, and again after, to work it into the soil.

Things You'll Need

  • Milky spore
  • Insecticide
  • Hand trowel


  • University of Illinois Extension: FAQ's on White Grubs in Lawns
  • Penn State: Take control of grubs in your lawn
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