Pests and pollination of oil-seed rape crops in England
Williams, Ingrid Helvi.
Ilford Central Association of Bee-keepers
1978
'A lecture given to the Central Association of Bee-keepers on 25th September, 1976' - p.1
Bibliography: p.11
Rape (Plant)
Rape (Plant)
Fertilization of plants by insects.
Bees