Few insects within our state are of greater economic importance than are the May beetles which in their larval stage as white grubs are serious pests to many growing crops. A normal loss is sustained from them throughout the state each year. The life cycle of at least the most destructive species seems to cover a period of three years and since one brood greatly exceeds the other two in abundance the years of 1921 and 1924 were times when the farmers paid heavy toll to these enemies of grasses, cereals and cultivated crops. This "Brood A" which was responsible for the heavy loss of the times mentioned, for years, confined its region of heavy infestation to the northeastern corner of the state but in 1921 moved south along the Mississippi river to the southern boundary of the state. The 1924 appearance showed Brood A holding their old territory and spreading to the west in the southern half of Iowa.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Jaques, H. E.
"A Preliminary Survey of May Beetles in Iowa,"
Proceedings of the Iowa Academy of Science, 33(1), 337-339.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/100