bat bug

C. Wayne Ellett Plant and Pest Diagnostic Clinic (CWE-PPDC)

Experts in identification of plant diseases, plant health problems, insects and insect related problems

The CWE-PPDC is a member of the National Plant Diagnostic Network. The clinic offers a broad spectrum of testing to identify pests and plant diseases as a fee-based service laboratory.  Diagnosticians collaborate with specialists in plant pathology, entomology, horticulture, agronomy, natural resources, and other areas to identify pests, plant diseases, and cultural and environmental problems of plants.

The PPDC accepts samples from:
Commercial production: vegetable, floriculture, ornamental, fruit, hops, and field crops.
Commercial landscaping companies and arborists: tree care, public parks/gardens, landscape management
Residential: homeowners or backyard gardeners, landscape ornamentals


PPDC is not a medical facility.
Samples from a person's or animal's body are not accepted.


Credit Card Payment


  1. Burying Beetles – Remarkable parents!!

    Sep 27, 2023

    Suranga Basnagala

    September 2022 the entomology department received a voicemail from Christian Centa in Doylestown OH. He said seeing a mating pair of burying beetles in his backyard trying to bury a mouse carcass. He was aware of the rarity of the Burying beetles, recorded the scene without disturbing them, and sent me the videos.

  2. Purple Carrot-Seed Moth from OH - NEW STATE RECORD

    Sep 6, 2023

    By Suranga Basnagala   Depressaria depressana (Fabricius) - (Depressariidae), Common names – Blunt’s flat-body, purple carrot-seed moth  Native range - Palearctic region (Western Europe through Russia – China)  
  3. Important Sample Submission Update

    Aug 15, 2023

    Good afternoon, clients of the Plant and Pest Diagnostic Clinic. We are excited to announce that we are now accepting credit card payment for  diagnostic samples processed by the Clinic, CFAES Wooster campus.

    Credit card payment