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At some of these sites high numbers of Japanese beetles now regularly occur and adult beetles are causing significant damage to leaves and flowers of many susceptible landscape plants. Recently, there have become a few permanent, reproducing populations of this insect in some communities along the Front Range of Colorado. From left to right: egg, larva (stage I), larva (stage II), larva (stage III), pupa, adult.įor close to a century, the Japanese beetle ( Popillia japonica) has been one of the most seriously damaging insect pests of both turfgrass and landscape plants over a broad area of the eastern US. Photograph courtesy of David Shetlar, the Ohio State University.įigure 7. White grubs feed on the roots of grasses. Japanese beetles that feed on leaves produce a characteristic skeletonizing pattern.įigure 6.
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Photograph courtesy of David Shetlar, the Ohio State University.įigure 5. The rastral pattern is located on the underside of the tip of the abdomen. The rastral pattern that is distinctive for white grubs of the Japanese beetle. Photograph courtesy of David Shetlar, the Ohio State University.įigure 4. White grubs (larvae) of the Japanese beetle. Japanese beetle damage to leaves of grape.įigure 3.
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Rose blossoms are one of the most highly favored foods of Japanese beetles.įigure 2.