The diseases of plants especially those diseases due to the invasion of parasites are always markedly influenced by the environment and therefore any discussion of their occurrence in a stated period must also involve a discussion of the weather during that period. According to the reports of Reed,1 the season of 1924 was characterized by a dry, cool spring, a rainy June and a cool summer. August was normal in temperature but with frequent heavy rains and September was unusually and persistently cool.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Gilman, Joseph C. and Porter, D. R.
"Observations of Plant Diseases in Iowa from 1924-1926,"
Proceedings of the Iowa Academy of Science, 34(1), 95-107.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/24