Japanese Beetle - Life Cycle

Life Cycle

  • A typical cluster of Japanese beetle eggs

  • Japanese beetle larva(grub worm)

  • Japanese beetle pupa

  • Japanese beetle adult

  • Mating, Ottawa, Ontario, Canada

  • Feeding, Ottawa, Ontario, Canada


The life cycle of the Japanese beetle is typically one year in most parts of the United States, but this can be extended in cooler climates; for instance, in its native Japan, the beetle's life cycle is two years long as a result of the higher latitudes of the grasslands required for the larval stage. During the larval stage, the white grubs can be identified by their V-shaped raster pattern.

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