9. A crop to produce pre-basic, basic or CS seed of hybrid or Italian ryegrass shall not be used to produce a crop in the second harvest year unless —
(a)pre-basic seed was produced in the first harvest year in which case basic seed may be produced in the second harvest year;
(b)basic seed was produced in the first harvest year from a crop grown from officially certified pre-basic seed, in which case CS seed may be produced in the second harvest year; or
(c)for a tetraploid variety of hybrid ryegrass, CS seed was produced in the first harvest year from a crop grown from officially certified basic seed, in which case CS seed may be produced in the second harvest year.