Passata
All over the western world governments are starting to introduce food safety bills.
One aspect of these bills is the control of seed stock and the mandatory use of purchased seeds as opposed to seeds from heirloom seed banks or self generated seeds.
I am guessing that the arguments for this would be for safety (seeds engineered to resist the latest upcoming catastrophe), agricultural productivity (seeds engineered to produce enough food to keep us all alive), terrorism (to prevent terrorists introducing food borne terror), and the enablement of sufficient agribusiness profitability allowing investment into R&D to ensure all these benefits are maintained.
Two predictions; we will be buying heirloom tomatoes on the black market and Italy will leave the EU.
offshore westerly 
yes great idea, get rid of diversity, stop people from growing their own food, push everyone to big corporate suppliers, drive up the price of food, make all tomatoes taste the same (or reduce the taste until they are all the same), more madness from Government who should not be involved in these decisions, people should grow what they want to grow.