This collection contains articles, slides, newsletters, correspondence, and other material on Dr. Martin M. Barnes, past University of California, Riverside, professor of entomology and plant pathology. Barnes' research was focused on the practical needs of agriculture. The bulk of the collection contains information on pests in California agriculture and information of his professional life at Cornell University and at the University of California, Riverside, Citrus Experiment Station.

The collection consists of materials related to the academic career of Joseph W. Eckert, an Emeritus Professor from the UC Riverside Plant Pathology department. Items in the collection include photographs, news clippings, and academic articles authored by Eckert on various aspects of disease spread and prevention in citrus and other types of plants.

The Howard S. Fawcett papers contain articles, magazine and newspaper clippings, correspondence, periodicals, transcripts of radio broadcasts and other material gathered on Howard S. Fawcett, a University of California, Riverside professor and noted pioneer in phytopathology. The bulk of the papers consist of writings and research related to citrus diseases.

This collection contains slides, photographs, and other material regarding plant disease used by Leo J. Klotz, former professor of Plant Pathology at the University of California, Riverside, in his research. The material in this collection has an emphasis on citrus and avocado disease.

This collection contains articles, plaques, certificates, news clippings, brochures, photographs, slides and other material from James M. Wallace's tenure as professor of Plant Pathology at the University of California, Riverside. The bulk of the papers consist of articles written by Wallace regarding citrus virus diseases and materials related to his founding and participation in the International Organization of Citrus Virologists (IOCV).

The George A. Zentmyer papers is a collection of newsletters, monographs, and magazines related to UC Riverside professor emeritus George A. Zentmyer’s research on phytophtoras, which are a genus of plant-damaging molds that can cause damage to crops and natural ecosystems. The collection also includes obituaties for Zentmyer, and a booklet from his funeral service in 2003.