1. Hyde, M. B., Ann. App. Biol., 38, 348 (1951).
2. Bose, S. R., Science, 117, 16 (1953).
3. Hansen, E. H., and Christensen, J. J., Min. Agric. Exp. Sta. Tech. Bull., 206, 1 (1953).
4. Personal communication from a member of the staff of the Central Rice Research Institute, Cuttack.
5. Mehta, P. R., Plant Protection Bull., New Delhi, 2, 50 (1950).