Grass-hopper depredations to farm crops have been of frequent occurrence in Iowa, and figure to a certain extent in the loss account of almost every year in at least some part of the state. Attacks during the summer of 1918 seem to have been the most extensive of recent years. Early in June the young nymphs were seen in great numbers in many of the counties in the southwestern part of the state and a few weeks later they had reached the same stage in the southeastern part of the state. As this indicates, complaints of serious damage came first from the southwestern counties, but before the summer had passed grass-hoppers in numbers to demand control were scattered well over the state. It is known that their damage was serious in at least forty-two counties, as shown by the appended map.
Proceedings of the Iowa Academy of Science
©1919 Iowa Academy of Science, Inc.
Jaques, H. E.
"Grass-Hopper Control Work in Iowa,"
Proceedings of the Iowa Academy of Science, 26(1), 133-142.
Available at: https://scholarworks.uni.edu/pias/vol26/iss1/17