7.
Council Directive 2007/33/EC of 11 June 2007 on the control of potato cyst nematodes and repealing Directive 69/465/EEC · European Union
The identity of the standard population used shall be checked using appropriate methods. It is recommended that at least two resistant varieties or two differential standard clones of known resistance capacity are used in the test experiments.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-08 · Text as adopted (Official Journal); later amendments are not incorporated in this text.