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Seed certification-field inspection - Netherlands
The inspection takes place 2-3 times during the growing period and once after haulm killing.
Fieldinspection The tolerance levels for the various classes are as follows:

first clonal generation : no visual symptoms + no positive reaction in laboratory (leaves of all plants tested).
second clonal generation : no visual symptoms + no positive reaction in laboratory (leaves of 50 plants tested ).
Summary field inspection tolerance levels:

For certain varieties and classes, additional laboratory test can be carried out (e.g. high classes, susceptible varieties, varieties in which virus symptoms are hardly ever visible).
In the laboratory at least 200 plants for classes SE and E, and for class A and C, 100 plants are tested.
If in the field the result of a laboratory test cannot be confirmed, new samples are taken for testing: 400 plants (leaves) for Classes SE and E, and 200 for class A and C.