Plant and Insect Diagnostic Clinic

NOTICE: The PIDC will be closed on July 4th and July 5th, 2024. Please allow for additional time for responses. Any samples for the week should be mailed such that they arrive by July 3rd; the PIDC is not responsible for samples that spoil from sitting in the mail. 

How to Submit a Sample

Get tips for submitting each sample type before you send to the clinic.

Submission Forms

Each sample you submit must be accompanied with a submission form. 


We recommend mailing your sample, but dropoffs are welcome during business hours.

Services We Offer

Here are the types of samples we accept for diagnosis: 

  • Whole plants or plant part problems
  • Insects, spiders, ticks, mites, and other arthropods from outdoors/indoors
  • Soybean cyst nematode egg counts
  • Complete soil nematode counts

Services We Do NOT Offer

  • Weed/plant identification (contact your local Extension office for help)
  • Tick disease testing
  • Mushroom identification
  • Pesticide residue testing
  • Soil and plant nutrient analyses 
  • Insects or arthropods causing skin irritation in humans or animals
  • Herbicide resistance testing

What We Do

Iowa State University Plant & Insect Diagnostic Clinic is supported by funding from ISU Extension & Outreach, ISU Department of Horticulture, ISU Department of Plant Pathology, Entomology, & Microbiology, ISU Integrated Pest Management, and the National Plant Diagnostic Network.