NAK Services tests seed potatoes and seed from cereals and grasses from all over the world.

NAK Services is a subsidiary of NAK (The Dutch General Inspection Service). NAK Services is a reliable, independent research institute for the agricultural sector that commissions its activities to NAK. All tests are carried out by the NAK laboratory.

Our new DNA laboratory works with the latest PCR-techniques, to provide results as quickly as possible.


NAK Services is partner of an organization which runs quality systems based on the EN ISO/IEC 17020:2012 (scope I124) and the EN ISO/IEC 17025:2005 (scope L490) norm. The seed laboratory is certified by ISTA (International Seed Testing Association) standards (scope).


NAK Services offers the following services:
– Trial fields
– Training and courses on field and lot inspection,
seeds, seed potatoes and laboratory methods.
– Laboratory tests:
– (seed) potatoes on viruses, nematodes and bacteria.
– cereals and grasses on germination, purity, moisture and health.
– soil samples on nematodes.

Test methods for seed potatoes

Virus Tests
NAK Services can analyse potato viruses PVA, PVM, PVS, PVX, PVY, PVV, PLRV (potato leaf roll virus), PMTV (potato mop top virus), TRV (Tobacco rattle virus) and TSWV (Tomato spotted wilt virus).

Meloidogyne chitwoodi (Mc) and M. fallax (Mf) tests on potatoes or soil. Testing of soil samples for the presence of potato cyst nematodes (PCN).

Potato tubers can also be tested for the presence of bacteria causing black leg/stem rot. This test will detect (latent) infections of Pectobacterium atrosepticumDickeya spp., Pectobacterium parmentieri and Pectobacterium carotovorum spp. brasiliensis.

NAK Services also offers tests for latent infections of bacterial ring rot caused by Clavibacter michiganensis subsp. sepedonicus (Cms) and/or brown rot caused by Ralstonia solanacearum (Rsol).

Find more information about analysing techniques and sample sizes below:

Details virus and bacterial diagnostics in potatoes

Total overview virus and bacterial diagnostics in potatoes

For an overview of prices, click here.

Compute percentage of diseased plants use: Seedcalc8 programme

Explanation Seedcalc

Labelrequest potato testing NAK

Contact information
For more information about NAK Services, please contact us
by e-mail: