Many Iris Problems

I'm just about ready to thow the towel in trying to grow Bearded German
Iris 'though I love them so much.
I prepared a new bed (4x30 ft.) 3 years ago to be used solely for
bearded iris,  incorporating plenty of peat moss.  When brown spots
developed on the leaves 3 years running I tried everything from cutting
the leaves off to spraying with Bordo every 10 days - to no avail.
Someone suggested the peat moss might have made the soil acidic and the
plant would be unable to get the nutrients it needed therefore causing
the spots so I added lime to the soil.  Last year most of the iris corms
were infested with iris borer and I dug every plant, cut out the rot and
borers, dusted with sulphur and replanted.  Early this spring I sprayed
once with Cygon which seems to have controlled the borers somewhat.
There was plenty of bloom but now that the blooms have finished  they
are rather ugly and the bed looks terrible.  All the leaves are affected
with brown spot, and the older leaves which first developed the brown
spots  have died and dried up.  If anyone can offer a suggestion as to
what I should do to alleviate this problem I would be most appreciative.

Delia, a newbie to the list

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