The adult emerald ash borer (Agrilus planipennis) is a metallic green beetle, about 1.3 cm (0.5 inch) long. It has a flattened back and purple abdominal segments beneath its wing covers. The immature forms are rarely seen as newly hatched larvae quickly bore into the tree. They create S-shaped tunnels as they feed, disrupting the plant’s vascular system and killing the tree in as little as one year or two years. The insects overwinter inside the tree and emerge as adults in the spring.
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