Eggs: The adult borer lays eggs into cracks and joints (batches of up to 120 eggs) on susceptable seasoned (dry) coniferous softwoods such as pine, fir and spruce.
Larvae: EHB larvae hatch from eggs and can live for 2-12 years (2-5 years in Western Australia). The larvae lives in tunnels or galleries in the wood. They are a creamy white colour with a rippled, elongated and cylindrical body, and enlarged flattened head. Larvae can grow up to 4cm in length.
Adult borer: Adult beetles are brownish-black to black and have a slightly flattened appearance.
The beetle’s wings are usually all black and may have distinctive white patches. On the top surface of the first body segment, behind the head, are two raised, black, shiny knobs like eyes.
Adults are 8-25mm in length with antennae about half as long as the body.