1. H. A. Hilo, and A. A. Genaf(1973 ). Direct field-seeding compared with nursery and field-grown seedlings on the yield of onion .Report of the Hudeiba Research Station for1969-70, PP.93 -94 .
2. PHYSIOLOGICAL RELATIONSHIPS BETWEEN INSECTS AND THEIR HOST PLANTS.
3. W. Guddoura(1971 ). Vegetable pests .Report of the Plant Protection Department, Sudan Government, for1970-71, p.4 .
4. Thrips resistance in the onion