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About WPDN

The Western Plant Diagnostic Network (WPDN) is a regional member of the larger National Plant Diagnostic Network (NPDN). NPDN consists of five regional plant diagnostic centers located at Cornell University (NEPDN); Michigan State University (NCPDN); Kansas State University (GPDN); the University of Florida (SPDN); and the University of California, Davis in partnership with the California Department of Food and Agriculture, Sacramento (WPDN). Each regional center coordinates data gathering, diagnostic collaboration, and other activities of member land grant institutions, national agencies and state departments of agriculture. WPDN is a consortium of land grant institutions and state departments of agriculture throughout the western United States and U.S. territories in the Pacific that provide services for plant disease diagnosis, plant identification, and insect/pest identification. WPDN uses a common software interface to process diagnostic requests and share information among diagnostic laboratories. The WPDN Brochure in Adobe Acrobat format

How You Can Help

If you see suspicious samples in the field please contact one of the following

  • County Ag Commissioners (California) or county extension agent
  • State Diagnostic Lab
  • State Department of Agriculture
  • Cooperative Extension Specialist

Information on the impact of the NPDN


Impact of the NPDN Fact Sheet 9-16-11

National Impact of the NPDN with Plant Inspection Information 9-16-11

NPDN PPV Case Study

NPDN Asian Soybean Rust Case Study

NPDN P. ramorum Case Study

Impact of the WPDN

Impacts of the NPDN in California