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.