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Lifecycle of the Japanese Beetle

This drawing shows the life cycle of one of the worst of all white grubs, the larvae of Japanese beetles. Japanese beetles are a double threat because as adults the winged beetles fly around the garden, feeding on flowers and foliage of many plants, especially roses and related species such as cherries.

To control the adult beetles, apply our "Attack" nematodes in the spring. The outdoor temperature should be above 50°F or apply late summer when the temperature in below 85°F and above 50°F.

Mature Grubs
Because white grubs are the larvae of a number of species, you can help protect your lawn from grub damage by identifying full-grown species of grubs. The following descriptions of mature grubs can help you spot areas around your home that may be at risk of grub damage.
May or June Beetles
Flying beetles

  • Attracted to house or street lights
  • Typically lay eggs in grass around well lighted areas

    • Japanese Beetle

  • Metallic green beetles with copper-brown wing covers
  • Attracted to plants including roses, linden, grapes and cherries
  • Typically lay eggs in sunny areas near plants
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