Dr Max Watkins, Technical Development Manager at Sandoz SPC Ltd, Camberly, UK, was one of IBRA's invited speakers at IBRA Day 1996, held during the Devon Beekeepers' Association beekeeping weekend at Seale-Hayne, Devon, UK. This article, based on his presentation at the meeting, explains simply what resistance is and gives beekeepers the latest information on the development of resistance in varroa and what can be done to avoid it.