Hemp Disease and Nematode Assays

UMass Extension Diagnostic Lab Accepting Hemp Samples from Licensed Growers

The UMass Extension Diagnostic Lab is now accepting hemp samples for analysis and evaluation of insect and disease problems.

Samples will be accepted only from licensed hemp growers in Massachusetts. Submission of a copy of the grower’s license is required. The lab is unable to accept hemp samples from states other than Massachusetts. The lab is not able to accept cannabis/marijuana samples or any other plant that does not meet the USDA definition of hemp (e.g. from plants that have or are intended to have a THC content greater than 0.3% in any part of the plant) and does not test hemp for THC, CBD, mycotoxin levels, or contaminants.

For information on collecting, packaging, and shipping hemp samples to the lab, please see the Guidelines for Submittting Hemp Specimens below, or call Dr. Angela Madeiras at 413-545-3209.

Download Form

Hemp Diagnostic Form (167.39 KB)

Guidelines for Sending Hemp Plant Specimens

  • Samples must be accompanied by a complete submission form (link above) and a clear photocopy of a valid Massachusetts hemp grower’s license. Samples arriving without both of these items will not be accepted under any circumstances.
  • Please do not send dead plants: dead or dried out material is insufficient for diagnosis.
  • If plants are less than 2 feet in height, submit 2-3 whole plants demonstrating the range of typical symptoms. The root ball of each plant should be wrapped securely to prevent soil from contaminating the aerial parts of the plant.
  • If plants are over 2 feet in height, please do not submit whole plants. Submit roots and crowns from 1-2 affected plants. In addition, send 3-4 branches displaying a range of typical symptoms. Include branches that show the area of transition between healthy and unhealthy tissue. If the main stem of the plant is affected, please include several short (a few inches) pieces.
  • Plant material should be packaged securely in order to contain any odor. Packing suggestions include vacuum packaging, airtight sealed plastic containers such as Tupperware, glass jars, or 4-5 layers of ziplock freezer bags. Do not include materials such as coffee grounds or dryer sheets in order to suppress odors. Please do not add water or damp paper towels.
  • Diagnoses cannot be made from photographs alone; however, photos are often helpful to the diagnostic process and may be submitted along with the sample or e-mailed to madeiras[at]umass[dot]edu.
  • If you have had the crop tested for THC and the level was 0.3% or less, please include a copy of this information.
  • Samples may be hand-delivered to the lab or sent via US Mail. The US Postal Service is the only carrier authorized to transport hemp. If hand delivering, please call the lab at 413-545-3209 to be sure someone will be present to receive the sample. Our business hours are 8:30am to 4pm Monday through Friday, but these are subject to change.
  • The USPS requires that you keep copies of these documents for at least two years, so be sure to photocopy all of them before sealing the package for shipping. The documents are not required at time of shipping, but they can be requested at any time, so you may want to have them with you when you go to the post office. For more information on packing and shipping hemp, please see: https://newcropsorganics.ces.ncsu.edu/2019/12/how-and-how-not-to-ship-hemp/

Collecting Samples for Nematode Analysis

If root galls are present, the roots may be submitted for analysis. Soil samples can be examined for root knot juveniles and other species of plant pathogenic nematodes. 

Nematode populations are estimated most accurately with a composite sample. Use a soil probe, trowel, or shovel, and collect 1-2 tablespoons of soil at a depth of approximately four inches. Collect 15 to 20 subsamples from throughout the area where plant symptoms are observed and put them all together in a single bag. The sample should equal 1-2 cups of soil. Submit a root sample along with the soil sample. Roots and soil may be placed in the same bag. If desired, a second sample collected from areas where plants are healthy may be submitted for comparison.

Packaging the sample: The soil should be placed in a sealable plastic bag to prevent desiccation. Do NOT add water. If submitting more than one sample, give each sample a name or number and write it clearly on the outside of the bag with a permanent marker. After collection, refrigerate or ship immediately. Submit samples with a completed submission form and a copy of the grower's license as described above.

Diagnostic Fees 

  • Hemp crop disease or nematode analysis - $50

Choose the appropriate catalog item that includes "hemp" in the product name. Enclose a copy of your credit card sales confirmation with the sample.