Instructions for submitting diagnostic samples

Before submitting your samples, please notify us by emailing You can also contact us by phone on +31 (0)71 33 26 255.

Submission form for diagnostics

Instructions for taking samples

  • Take samples from a spot where the new symptoms are visible. It is often not possible to run laboratory tests on plants that have died off completely.
  • Take a sample before any pesticides/crop protection agents are applied. Pesticides can destroy or mask the symptoms caused by pathogens and interfere with the laboratory tests.
  • If the symptoms are unclear, send us the entire plant.
  • Where symptoms are unclear, or in the case of a rare plant, please also send us part of a healthy specimen. Pack the healthy sample separately and indicate on the label that it is healthy material.
  • If it is impossible to send a sample immediately, keep it cool. Never place samples in direct sunlight.

Instructions for packaging samples

  • Make sure leaves and flowers are not contaminated by any soil or growing media accompanying the samples. Enclose the roots in a separate bag with an elastic band around the stem.
  • Wrap the whole plant in paper to prevent it from drying out and rotting. The paper regulates moisture levels in the plastic bag. Use dry paper.
  • Affix a sticker with sample information on the packaging.
  • Do not use sample information stickers to seal the package.
  • Wrap the entire plant in plastic to prevent the spread of diseases.
  • Affix the order form in an envelope to the outside of the packaging.
  • Keep in mind that parcel delivery services may handle boxes roughly. Boxes should therefore be well filled.

Instructions for completing the order form

  • Enter the correct name and address on the form.
  • Provide as much information as possible about the sample; this helps us produce a diagnosis more quickly.
  • If you have any digital photos of the material, you can email them to us.

Shipping address for diagnostic samples

Diagnostics Team
P.O. Box 40
2370 AA Roelofarendsveen, the Netherlands