Pulmonaria

It's been raining here in east central Illinois guite a bit over the last
3-4 weeks.  A number of my plants appear to be suffering from this excess,
especially noticeable in the pulmonaria. (The lower leaves of the lamb's
ears are covered with tan spots which I assume is from the same cause, and
some of my cone flowers that are not in full sun are getting rust.)

My Pulmonaria "Majeste" were especially ruined by large black dry patches in
the leaves; where these patches appear, the leaves curl a bit and there is
no juice in the cells.  I dug one up expecting to find rotted roots and they
were white and growing nicely.  No varmints [bugs, rabbits, slugs] appear to
have been involved.

So I'm thinking this is a fungus or powdery mildew (the leaves are white and
fuzzy, so there's no seeing any white powdery mildew if it's there) and
calls for lime-sulphur dusting??  Does anyone know if this is probably a
fungus, has anyone dealt with this problem before, and if so, how?  I took
the one I dug up back to the nursery where I bought it and they didn't know
what it was, but planned to cut it down to the ground and let it grow back
in the greenhouse.  This is what I did with my remaining 3 tho I have no
greenhouse, but I'd like to know what's going on and how to prevent a
recurrance.

Thanks!
Diann
zone 5b
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