A grubs final state is the Japanese beetle. It was first discovered in the United States in 1916 and thrives in all of the Northern United States.

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The grub begins its life feeding on the roots and underground stems of turfgrass (your lawn). They are extremely destructive long before the human eye sees the actual damage. 

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Damage you would see in late summer or early fall is dead/brown grass patches. (You typically can roll these patches back like carpet. You may even see these unsightly pests hanging out.) If you find 5-10 grubs in a 1'x1' area you don't need to worry. But if you are finding 10 or more grub in a small area, you need to be concerned.

 

 You may experience a spongy feel when walking on damaged turf. 

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After the grub damage your lawn and emerge as Japanese Beetles they begin to feed on your plants, flowers and foliage of trees in the area. 

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These grubs are a food source for skunks, and greater damage can occur as the skunks dig up your lawn to eat the grub. 

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