Black-spotted Longhorn | Hainault Forest

Black-spotted Longhorn

Rhagium mordax

Adults (13-22mm) are found from spring until autumn on umbellifers, hawthorn and elder in wooded locations. After mating the females oviposit eggs in cracks of tree bark usually where the wood is soft and starting to rot. The larvae make shallow galleries under the bark seldom entering the tissue that carries water and dissolved minerals upward through the tree. The young take 2-3 years to develop before reaching adulthood.

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