Hello all - is anyone else suffering from mildew more than usual or do I blame the weather ? Or rather, is anyone else's plants suffering from mildew I should say 
I have a clematis, sweet peas, roses, and a small potted wisteria all with what I believe is mildew. I've sprayed the roses to keep it in check but nothing else. Everything has access to air - I know mildew can be caused by lack of airflow / being close to a wall etc.
I'm probably going to take the sweet peas out - they are past their best I think and the blooms shrivel as soon as they appear. I find my sweet peas always go yellow near the bottom, but they seem mildewy all the way up this year.
Do I just blame the weather or could anything else be the cause do you think?