In 2022 the Department of Plant Pathology and Microbiology and the Department of Entomology became the Department of Plant Pathology, Entomology, and Microbiology (PPEM). But before this each department had a rich history at Iowa State University. Below are some resources documenting that history.
Entomology
Annual Newsletter for Alumni and Friends (produced 2000-2021)
A Brief History of Entomology at Iowa State by Robert E. Lewis (see page 6) [PDF]
History of the USDA Corn Insects Research Unit and Timeline of Entomology at ISU [PDF].
Historical Photos of the Department of Entomology (1981-1986)
Plant Pathology and Microbiology
History of Plant Pathology at Iowa State University by Don Norton [PDF]
Monthly Newsletter for PLPM (produced 2015-2020)