Plant and Pest Diagnostic Lab

The Purdue University Plant and Pest Diagnostic Laboratory works to diagnose plant diseases and identify insects, plants and weeds and other plant and pest problems. This service is provided for the specialists and county extension educators of the Purdue University Cooperative Extension Service and Purdue University's research faculty, staff, and students as well as for private businesses and citizens of Indiana.​

If you drop off a sample please leave it on the table outside of our office with your completed submission form. We will pick up the samples throughout the day. Please also consider sending photos using our upload forms

*The PPDL and county extension offices DO NOT provide soil or tissue testing. Please see our Publications page for a list of commercial labs.


Parking Alert: Russell Street is closed through July 31st.  You must use State Street to get to the lab to drop off samples.



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     Meet the Team

Contact Us

Tom Creswell, Lab Director

John Bonkowski, Plant Disease Diagnostician

Todd Abrahamson, Clerk IV

Plant and Pest Diagnostic Laboratory
Purdue University
915 West State Street, LSPS 116
West Lafayette IN 47907-2054​
: 765-494-7071
: 765-494-3958


               Map to Lab


PARKING:  A reserved metered parking space is available at the west entrance to the LSPS Plant and Soils Building. A secondary location to park is the Harrison Street parking garage.  If you encounter any problems with parking please call 765-494-7071. 

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