I was pretty certain it was the climate, Margie,
and perhaps the difference in soil may have something to do with it,
assuming your soil is sandy rather than clay. Some theorize that the
fungus is spread from the soil to iris fans through rain splashing mud onto the
fans. I would imagine that splashing sandy soil is less likely than
heavier clay soil. Once you have leaf spot extreme diligence is called for
to keep it under control. Oh well, I certainly enjoy seeing your
wonderful foliage along with your beautiful blossoms in your lovely
In the Arizona desert areas, I think it is rare
to get leaf spot, though once in a while it may show up on an iris
plant or two. Low humidity and no rain may be why. (I'm
guessing that those that do, may be more genetically
Oro Valley, AZ.
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