Grape vines, fruit, and leaves

All samples require a Plant Diagnostic Request Form

Sampling Instructions:

  • Examine plants to assess symptoms and distribution. Complete the Plant Diagnostic Request Form and include it with the sample in a separate zip-seal bag.
  • Collect a representative symptomatic sample that fully describes the observed problem. Submit a generous amount of plant material. 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 Samples: place the sample in a zip-seal bag as soon as it is collected. Do not use paper bags.
    • Vine Samples: Cut vines which show the symptoms of concern by making the sampling cut several inches below the last visible symptoms. Make sure to include both leaves and stems if sampling during the growing season.
    • Fruit Samples: Pick symptomatic bunches of fruit. Wrap each bunch in newspaper or paper towels so that any excess moisture will be absorbed and will not contaminate the sample. Pack the wrapped fruit clusters in a sturdy box.  If shipping fruit clusters along with a vine sample, box the fruit separately so that the fruit will not suffer additional bruising.
  • Place the sample in a crush-proof box with sufficient packing material and mail using next-day or two-day shipping, or deliver the sample in-person to minimize temperature damage. 
  • Write “Live plant Sample” on the outside of the box
  • Photos of the problem in the field are always helpful and 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: