The Purdue Plant and Pest Diagnostic Laboratory

Welcome to the Virtual PPDL

Important Announcements

The PPDL will be open but operating with reduced staff July 29-August 3, 2016.  Samples for disease diagnosis received during this period will be refrigerated until they can be evaluated beginning August 4, 2016.

new Updated Form: Herbicide Resistance Testing

Featured Links:


Trees, Ornamentals, Fruits and Vegetables




Plant and Pest Diagnostic Laboratory
Purdue University
915 West State Street
West Lafayette IN 47907-2054

Voice: 765-494-7071
FAX: 765-494-3958


Our Image Use Statement

Picture(s) of the Week:Using Air-Spades to Correct Root Deformations, Deep Planting, and Compactions on Established Trees

What's Hot: Why do mosquitos bite me and not you?

What's Hot: Tulip Tree Leaf Drop - No Cause For Alarm

Indiana Department of Natural Resources

NPDN Training and Education

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service