It is important in a study of plant diseases to understand the causes of wide-spread epidemics; notes on the prevalence of diseases, and their seasonal and geographical distribution, are an aid to this knowledge.
Proceedings of the Iowa Academy of Science
©1909 Iowa Academy of Science, Inc.
Pammel, L. H. and King, Charlotte M.
"Notes on Factors in Fungus Diseases of Plants, with Records of Occurrences of Plant Diseases at Ames for a Period of Twenty Five Years,"
Proceedings of the Iowa Academy of Science, 16(1), 41-97.
Available at: https://scholarworks.uni.edu/pias/vol16/iss1/11