What's ailing my Coleus??

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I'm getting this discoloration on the leaves of my red Coleus - only the red. The spots are only on the older leaves. There are no visible signs of ?? on the cuttings I've taken from these plants. I've sprayed the affected plants with a fungicide, with no results. Any ideas??? Forgot to mention, they are in my greenhouse.
what s ailing my coleus, gardening
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