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Flatheaded appletree borer

Chrysobothris femorata (Olivier)
Coleoptera: Buprestidae

The adult is a short-horned beetle, flattened above, with short antennae and large conspicuous eyes (A). The upper surface of the body is dark metallic brown with slightly patterned wing covers. Underneath the wing covers (as seen in flight), the body is a bright metallic blue. The beetle's undersurface is coppery bronze. The larva (B) is light yellow and has a characteristic enlargement of the thoracic segments (just behind the head), which gives this insect its common name.

Distribution

Most fruit-growing states and provinces in eastern North America.

Damage

Attack apples mainly, but most deciduous tree fruits are susceptible. The larvae dig tunnels along the extent of the trunk. Injured spots are slightly depressed and darker (C). These depressions may split over time and can be enlarged every year by succeeding generations that attack the dead wood on the border of the injured area. The borers will often girdle a small tree, and a single larva can kill the tree.

Management

Flatheaded borers are attracted to diseased or weakened trees and newly transplanted nursery stock. Trees suffering from sunscald are particularly susceptible. An insecticide can be applied to the trunk against egg-laying adults in early to midsummer.

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The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the AgBioResearch, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.