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What is it?

Grubs are larvae. They come from a variety of different beetles, including Asiatic, Japanese, May and June beetles.

What does it look like?

In late August and early September, the lawn grass will turn brown. There will be large patches of discoloration, irregularly shaped, which roll easily like a carpet. Grubs will appear milky white, anywhere from 1/8 to 1 inch long. They have brown heads, three pair of legs and lie curled in the soil.

How does it manifest?

Adult beetles are not the cause of damage in the lawn; it is the grubs, which hatch from the eggs they lay that do the damage. When the eggs hatch, grubs feed down 1 to 3 inches in the soil on grass roots. They can survive the winter by burrowing deep into the soil, and when thaw comes in the spring they will begin feeding again.

What can you do about it?

Apply an insecticide containing diazinon, chlorpyrifos or isofenophos when you first notice the grub damage in your lawn. The younger the grubs, the easier they are to kill off. Preventative control consists of applying the insecticide just after eggs are laid. You can find out the proper time to do this by contacting your local cooperative extension office. After applying insecticide, thoroughly water the lawn to be sure the insecticide hits the root zone. Grubs often remain active up to 30 days after treatment, and occasionally successive treatments may be necessary to completely eradicate the grubs.