Fruit from residential gardens or commercial grow operations.

All samples require a Plant Diagnostic Request Form

Sampling Instructions:

  • Carefully examine your plants to accurately assess symptoms and distribution. Complete the Plant Diagnostic Request Form in entirety, and include it with the sample in a separate zip-seal bag.
  • Collect a representative symptomatic sample that fully describes the observed problem. The entire plant may be needed for the most accurate diagnosis. This is especially important with vascular and root rot pathogens. It is important to look at roots and lower stem to have whole picture of the problem. Digging out the plant helps to preserve the integrity of the root system.
  • Submit a generous amount of plant material. If the plants are small (i.e. seedlings), send several plants. Samples from different plant species should be bagged separately and labeled.
  • A mixture of living tissue and necrotic tissue is needed to isolate the pathogen and diagnose the disease. Do not send dried or dead plants
    • Leaf or Stem Tissue Samples: place the sample in a zip-seal bag as soon as it is collected. Do not use paper bags.
    • Fruit Samples: Separate fruit (i.e. berries, apples, peaches) samples from roots and top growth material. Fruit with tender skin (strawberries, blueberries, currants, raspberries, peaches etc.) should be placed in a paper bag as soon as it is collected. Fruit with a tough skin (grapes, apples, plums, etc.) can be placed in zip-seal bags.
    • Entire Plant/Tree Samples: For entire plant samples, bag (plastic) the roots and seal at the soil line with a twist tie or a rubberband. Do not cut the root ball off the above-ground plant parts. Cover the top plant growth with a second plastic bag.
  • Place the sample/samples in a crush-proof box and mail it using next-day or two-day shipping option or deliver the sample in-person to minimize damage from cold or heat and allow the sample to arrive fresh. 
  • Write “Live plant Sample” on the outside of the box
  • Photos may be emailed to

Mailing Address:
C. Wayne Ellett OSU Plant and Pest Plant Diagnostic Clinic 
c/o Dr. Francesca Rotondo
234 Selby Hall
1680 Madison Ave., Wooster, OH 44691

Sample Drop-off:
Must be coordinated with Dr. Rotondo: Phone: (330-263-3721) | Email: