disease question

Ok, enough with the pretty flowers.  :-)  Attached is a photo of what I’m calling “early foliage die-back.”  I plan to dig the bulbs shortly and soak them in a fungicide.  The cultivar ‘Peggy Macneale’ 2 W-W has exhibited this problem each year, and so far, the fungicide treatment seems to be keeping it alive.  I see it this year also in my stock of ‘Norwester’ 6 Y-Y.  Is this something that requires hot water treatment?
Thanks for all your help.
Mary Lou