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Irregular brown patches of dying grass are the first sign.

More than 5 grubs per square foot of lawn soil will produce symptoms of white grub damage.īefore you start treating, it is important to check to make sure that indeed there are grubs damaging your lawn. A few of these pests shouldn’t stress your grass, but a large number of them can cause serious damage. Presence of many grubs in the soil: A major sign of grub infestation in your lawn is the presence of the milky-white, C-shaped worms in soil samples cut from your yard.If you notice there’s increased activity of these predators digging your lawn, it could be a sign there are grubs in your lawn.

Increased raccoon and bird activity: Birds, moles, and raccoons feed on worms and other insects in the lawn.

To test this symptom, you can do a tug test on your grass to see if it pulls up too easily.

A spongy turf: Grubs will damage the roots of turfgrass, leaving the grass easy to pull and roll up just like carpet.

Check out this great article I did on other causes of brown patches in lawns. This occurs because grubs feed on roots, thus killing your turfgrass easily.

Dead patches in the lawn: You’ll observe patches of brown or dead spots as the grass starts to thin out, turn yellow, and die.