Visit the Plant and Pest Diagnostic Lab Home Page

The Purdue University   Plant and Pest Diagnostic Lab  (PPDL) is an interdisciplinary facility that provides rapid an​d accurate identification of plants, pests, and plant problems; suggests management strategies, when requested; and is a source of unbiased information for plant- and pest-related problems. This service is available to growers, Extension personnel, private businesses, and the general public.

Contact us at:​

Got pictures of your plant problem? See our new  photo upload site

Plant and Soils Building (LSPS) Room 116

915 West State Street 
West Lafayette, IN 47907
765-494-3958 (Fax)​​

PPDL Personnel

Tom Creswell

Dr. Tom Creswell

Clinical Engagement Professor | Plant Disease Diagnostician/ Director, PPDL
765.494.3958 (fax)
John Bonkowski

John Bonkowski

Plant Disease Diagnostician
765.494.3958 (fax)
Todd Abrahamson

Todd Abrahamson

765.494.3958 (fax)