1. Selective eating of the acyanogenic form of Trifolium repens
2. Anon. (1985 ). Recommended varieties of oilseed rape 1985 . National Institute of Agricultural Botany, Farmers Leaflet No. 9, Cambridge. 8 pp.
3. Anon. (1986 ). Recommended varieties of oilseed rape 1986 . National Institute of Agricultural Botany, Farmers Leaflet No. 9, Cambridge. 8 pp.