Leeks

January update..... just to say that I did not loose my leeks, they recovered and many are still in the ground, they are not huge, I am picking the largest first and stripping the top layers or so of leaves which show some rust, they then present a good white stem that smells and tastes great.  Glad I left them to themselves to see if they would recover. Thanks for the advice.

My leek crops usually get quite a bit of rust.  However this year, I have grown the same varieties, Bleu de Solaise and Jaunes de Poitou as usual, and not a spot of rust anywhere.   

Wondering why this could be, especially as it has been relatively warm and wet.   I planted at the same density too.