The varietal situation has undergone great changes within the last decade. The introduction of hybrids, plant breeders’ rights and national seed lists have all been responsible for genetic erosion and many land races [farm bred varieties] have now disappeared.
In fact, since the author started collecting these in 1982 approximately 40% of the growers have now discontinued the practice of saving and selecting their own seed. Indeed collection was already too late for many crops […].
R. F. Murphy. ‘Final report. Collection of land races of all crucifiers in the Republic of Ireland’. E.C. Collection Programme 6 – Ireland – CP 6. Kinsealy Research Centre, Dublin 5. 1984.