10. In the case of the production of seed of a hybrid variety of sunflower —E+W
(a)sufficient pollen shall be shed by the plants of the male component while the plants of the female component are in flower;
(b)where the female component plants have receptive stigmas, the percentage by number of female component plants which have shed pollen or are shedding pollen shall not exceed 0.5%;
(c)for the production of basic seed, the total percentage by number of plants of the female component which are recognisable as obviously not being true to the component and which have shed pollen or are shedding pollen shall not exceed 0.5%; and
(d)where a female male-sterile component and a male component which contains a specific restorer line or lines which restore male fertility has been used for the production of CS seed, at least one third of the plants grown from CS seed of the resulting hybrid shall produce pollen which appears normal in all respects.