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Powdery Mildew and other diseases

 All my 'Green Ice' mini roses in my window boxes have powdery mildew.  I
have cut them back to about an inch from the dirt, do I have to remove them
so my other plants don't get infected- is it in the soil?   Also my peonies
are mysteriously drooping in some of their stems.  I keep cutting off the
affected ones- anything else I can do.  Lastly columbine leaves have I
think mosaic virus, squiggly marks on the leaves- again I cut them right
off but they keep coming back with more like that.
http://www.ime.net/~chpetten/Page3.html


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