The last study of the distribution of brood III in Iowa was apparently that made by Professor Bessey in 1878. This report was based upon information obtained from questionnaire postcards, from an inquiry published in the State Agricultural College Quarterly and from interviews with college students. From these sources he received reports of the brood being present in twenty-eight counties the spring of 1878. Many of his correspondents stated that the cicadas were not as abundant in 1878 as they were in 1861 and Professor Bessey wondered if this brood might be dying out. There can be no doubt but that the brood must be decreasing in numbers of individuals and the distribution is becoming more limited into local areas. So much of Iowa has been brought under cultivation in the past sixty-eight years that innumerable cicada habitats must have been obliterated. No population studies or specific distribution records are available, so there is actually no way of making an accurate comparison of the present distribution and abundance with that of the past.
Proceedings of the Iowa Academy of Science
©1947 Iowa Academy of Science, Inc.
Hardy, D. Elmo
"The Periodical Cicada, Brood III, in Iowa,"
Proceedings of the Iowa Academy of Science, 54(1), 311-315.
Available at: https://scholarworks.uni.edu/pias/vol54/iss1/51