We are very dry here in west Suffolk. Will keep monitoring. I did put phosphite and amino acids on along with nutrients after tissue testing. That whole school of thought isn’t very well researched though so is abit of a guessing game.I think you are right it is variety dependent, in combination with conditions. Over here by the coast yr infection is the norm on many varieties earlier on, at the beginning of March yr could be found in both kerrin and gravity. ATM it would be difficult to differentiate between septoria and yr since the septoria always seems to follow yr onto the leaves. Doesn’t mean the yr isn’t there though.