Slug & snail pests in agriculture : proceeding of a symposium organised by the British Crop Protection Council in conjunction with the Association of Applied Biologists and the Malacological Society of London, held at the University of Kent, Canterbury, UK on 24-26 September 1996, chaired by I F Hender - British Crop Protection Council; Association of Applied Biologists; Malacological Society of London (BCPC symposium proceedings, 1996)