This course provides a broad-based understanding of the basic principles of plant pathology. Topics include history of the science and the causes, effects, diagnosis, and management of economic plant diseases. The emphasis is on plant diseases of field and horticultural plant species that are economically- important to the region, potentially-impactful for modern consumers, or are pertinent to the history of the science. Coreq: PPTH 424L. Dual-listing: PPTH 624.