 These worms are the immature stage of beetles, in most cases either Japanese beetles or green June beetles. Both of these insects have one generation per year. After the beetles mate in summer, they lay eggs, quit flying around, and die. Soon after, the eggs hatch, and the larvae of these beetles, known as grub worms, feed in the soil during the warm days of fall. As the soil temperature falls, they burrow deeper to spend the winter. Depending on the weather, they may be higher and lower in the soil until spring when it warms. Then they will be back up near the surface and feeding on grass roots again. By early summer, they are pupating to emerge again as flying adults.
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