PART IIIConditions to be examined mainly by inspections of control plots
17.—(1) In the case of a hybrid of barley, durum wheat, oats, spelt wheat, wheat and self-pollinating triticale, the minimum varietal purity shall be 90% in the case of CS seed.
(2) For the purposes of sub-paragraph (1), the minimum varietal purity of seed shall be examined on an appropriate proportion of samples.
18. Seed of a hybrid of rye shall not be certified as CS seed unless due account has been taken of the results of an official post-control test on samples of basic seed taken officially and carried out during the growing season of the seed entered for certification as CS seed to ascertain whether the basic seed met the requirements for basic seed laid down in these Regulations in respect of identity and purity as regards the characters of the components, including male sterility.