Investigate diseases of major tree fruit grown in Washington State and Pacific North West with a focus on applied epidemiology of major pathogens in orchards and its linkage to post-harvest disease problems. Develop rational IPM approaches for tree fruit diseases management. Use of standard and molecular tools for accurate risk assessment related to fungicide resistance development and management. Extension efforts of the program are dedicated to develop and promote innovative and effective methods and technologies to provide appropriate information for multiples stakeholders.