This contingency plan provides background information on the pest biology and available control measures to assist with preparedness for an incursion into Australia of the longicorn beetle Anoplophora chinensis. While many species of longicorn beetles occur throughout the world, this document will refer only to this species (referred to by the common name Citrus longicorn beetle) unless otherwise stated. It provides guidelines and options for steps to be undertaken and considered when developing a Response Plan to this pest. Any Response Plan developed using information in whole or in part from this contingency plan must follow procedures as set out in PLANTPLAN and be endorsed by the National Management Group prior to implementation.