Grapes

Samples of grape vines, fruit, and leaves can be submitted to the C. Wayne Ellett Plant and Pest Diagnostic Clinic for diagnosis.

Vine Samples:

  1. Cut vines which show the symptoms of concern by making the sampling cut several inches below the last visible symptoms. 
  2. Make sure to include both leaves and stems if sampling during the growing season.
  3. Samples should be carefully packaged in a sturdy box and shipped early in the week to avoid weekend layovers during which the sample will deteriorate.
  4. Include a completed General Form.
  5. Pictures of the problem in the field are always helpful.

Fruit Samples:

  1. Pick symptomatic bunches of fruit. 
  2. Wrap each bunch in newspaper or paper towels so that any excess moisture will be absorbed and will not contaminate the sample.
  3. 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.
  4. Samples should be carefully packaged and shipped early in the week to avoid weekend layovers during which the sample will deteriorate.
  5. Include a completed General Form.
  6. Pictures of the problem in the field are always helpful.

Sampling Hints:

  • Samples should be fresh.
  • Samples should represent the early to middle stages of the development of the problem.  A completely dead and decaying sample cannot be reliably diagnosed.
  • Samples should be carefully packaged and shipped early in the week to avoid weekend layovers during which the sample will deteriorate.
  • Be sure to include sample documentation and background information.  The specimen form can be downloaded from:  General Form
  • Pictures of the problem in the field are always helpful.