What is the life cycle of the Japanese beetle?

Question:

What is the life cycle of the Japanese beetle?

Answer:

In Iowa, adult beetles emerge in mid-June through July. Japanese beetles are similar to other Junebugs in appearance and 3/8 inch long and 1/4 inch wide. The head and thorax are shiny metallic green and the wing covers are coppery red. A distinguishing feature of the beetles is five tufts of white hairs on each side of the abdomen.

Japanese beetle larvae are typical white grubs. The larvae are in the soil from August until June where they feed on plant roots (especially turfgrass) and organic matter. The grubs are C-shaped and approximately 1.25 inches long when full grown.