1. Abo, M. E. 1998.Studies on the mode of transmission of rice yellow mottle virus, 148Zaria, Nigeria: Ahmadu Bello University. Unpublished PhD thesis,
2. Akhabuhaya, J. and Lodenius, N. 1988.Pesticides in Tanzania, Publication no. 10 128Department of Environmental Conservation, University of Helsinki. Helsinki Press.
3. Alain, M. S. 1984.Insect survey, IITA annual report 67Ibadan, Nigeria
4. Ali, F. H. 1999.Epidemiology of rice yellow mottle virus in Tanzania, 148University of Greenwich. Unpublished PhD thesis,