1. Steinhaus, E. A., “Principles of Insect Pathology”, 470 (McGraw-Hill Book Co., New York, 1949).
2. Mally, F. W., U.S.D.A. Div. Entom. Bull., 24, 48 (1891).
3. Glaser, R. W., and Chapman, J. W., J. Econ. Entom., 8, 140 (1915).
4. Parsons, F. S., Progr. Reports Expt. Stations Season 1934–35. London, Empire Cotton Growing Corp., quoted from Rev. App. Entom., 24, 279 (1936).
5. Stahler, N., J. Econ. Entom., 32, 151 (1939).