(b)where official growing trials carried out in the applicant Member States, Article 5(4) being applied correspondingly, show that the variety does not, in any part of its territory, produce results corresponding to those obtained from a comparable variety accepted in the territory of that Member State or, where it is well known that the variety is not suitable for cultivation in any part of its territory because of its type of maturity class. The application shall be lodged before the end of the third calendar year following that of acceptance;