Tree & Shrub Diagnostics

Guidelines for Sending Tree & Shrub Specimens:

Please submit samples based on the following guidelines for tree and shrub diseases, tree and shrub insect identification, and landscape weed identification.

Fill out the diagnostic form as completely as possible. The information supplied will enable a more thorough and accurate diagnosis. This form must accompany each specimen sent to the lab. Include your phone number and e-mail address so that we may contact you for further information or inform you of the diagnosis.

1. Disease Samples: Send several branch and/or twig sections (approximately 6-12" in length) along with foliage (leaves and needles) showing the range of symptoms exhibited by the plant(s). Select portions of the plant that were recently killed (i.e. leaves, shoot tips, branch segments, roots, etc.) and the margins between diseased and healthy tissues (i.e. the margin between cankered and healthy branch tissue). Plant material that has been dead for more than one season is often of limited diagnostic value because it contains secondary organisms that make detection of the primary pathogen difficult.
   • Place leaves, branches, and other plant parts in a plastic bag and seal it. Do not add moist towels or moisten the sample before sealing it.
   • When sending entire plants, dig rather than pull roots from the soil. Wrap roots and attached soil in a plastic bag and secure to the trunk with a twist tie. Place a second bag over the foliage and punch a few holes through this bag for ventilation. Do not add additional water or moist towels.
   • Vascular wilt specimens: Plants or plant parts that suddenly wilt may be infected with a vascular disease. Branch or stem sections 1/4" to 1" in diameter and 6" to 12" long should be taken from the wilting plant or recently wilted plant part. Avoid sending plant material that has been dead for any length of time.
2. Insect Samples: Immature and soft-bodied insects should be placed in 70% ethyl alcohol (rubbing alcohol is not ideal, but may work). Other insects must be carefully packaged. Do not place loose insects into envelopes for mailing, as the automatic process for handling mail will most likely destroy the specimens.
3. Fill out the submission form as thoroughly as possible. It's ok if you don't know all of the answers to our questions, but any information you can provide about the situation will be helpful.

Diagnostic Fees 

• Tree or shrub disease analysis - $50
• Tree or shrub insect ID - $50

Please see our homepage for payment options.