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HOUSE LONGHORN BEETLE - Hylotrupes Bajulus

Timbers attacked

Sapwood of seasoned softwood.

Damage

Very severe tunnelling in sapwood; can lead to structural collapse. Frequently only a thin surface veneer of sound wood remains. Exit holes are oval (5mm x 9mm) and tunnels are somewhat flattened and full of 'sausage' shaped pellets.

Life cycle (4+ years)

i. Adult: Emerge July - September
ii. Eggs: Laid in fan shaped pattern in cracks in wood; white spindle shaped. Up to 200 laid.
iii. Larva: Feeds in sapwood for more than 4 years. Causes extensive damage; reaches up to 30mm in length.
iv. Pupa: Takes place about 3 weeks prior to emergence.

Notes

Damage can be confused with Forest Longhorn damage. Localised distribution around SE England

Quick Identification

Large oval exit holes; loose sausage shaped frass. Tunnels frequently coalesce and not individually identifiable. Ridges on surface of tunnels.

Damage

Internally worse than it appears externally.