1. Burrill, A. C., Phytopathology 5: 343 (1915).
2. Ontario Agr. College Bulletin 1909 176
3. STEWART, V.B., PHYTOPATHOLOGY 3: 273 (1913).
4. STEWART, V.B., PHYTOPATHOLOGY 6: 152 (1916).
5. New York State Agricultural Experiment Station Bulletin 1913 329