Japanese beetle

Japanese beetle

Popillia japonica Newman

Coleoptera: Scarabaeidae


Japanese beetles can be present from June through September. Beetles lay eggs underground in grassy areas near vineyards, preferring soil with moisture.This pest can be a problem particularly in new vineyards using grow tubes. Frequent monitoring is required to reduce the risk of severe damage.

  • Damage

    Attacks all tree fruits, particularly peach and apple. Adults (only) feed on the surface of the fruit and leaves of deciduous fruits (B, C). The fruit may be partly peeled and gouged in irregular shallow patches, or nearly devoured. The leaves are skeletonized (B). Damage is more severe in sandy locations, often occurring especially at orchard edges in proximity to grassy areas.

    Management

    Feeding damage from adults is sporadic and transient during the summer. If needed, an insecticide can be applied when leaf damage or the insects feeding on foliage are noted in the trees; retreatment may be necessary as new adults arrive. Biological control of Japanese beetle may be elected through use of milky spores of bacteria or nematode products.

    Crops Affected

    • Apples
    • Cherries
    • Grapes
    • Peaches
    • Pears
    • Plums

Similar Species

  • Green June beetle

    Insect

    The adult is velvet green dorsally with yellow-orange margins on the elytra. Ventrally it is a shiny metallic green mixed with orangish yellow. The larva is a large, C-shaped grub that lives in the soil and is not found in the trees.

    Adult is velvet green dorsally with yellow-orange margins on the elytra.
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