1. Anon . (1982 ).Techniques for measuring soil physical properties. Reference Book No. 441, Ministry of Agriculture, Fisheries and Food, UK, 116 pp.
2. Anon . (1984 ).Slugs and snails. Leaflet 115, Ministry of Agriculture, Fisheries and Food, UK, 12 pp.
3. Effects of soil compaction on damage to wheat seeds by three pest species of slug
4. R. Cair, J. E. E. Jenkins, and E. Lester (1987 ). Cereal Pests and Diseases (fourth edition ). Ipswich: Farming Press, pp.268 .
5. D. M. Glen (1989 ). Understanding and predicting slug problems in cereals . InSlugs and Snails in World Agriculture. Proceedings of a symposium organized by the British Crop Protection Council and the Malacological Society of London, pp.253 -262 .