The last picture (#5) looks like dirt, but the black spots in the third from the top (#3) looks like a different story. Most of the spots are too uniform in shape to be just dirt. You might want to clean the under side on just one of those leaves then come back in about a hour and check if any black spots have returned.
Dutch
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"Discretion is the better part of valor" Charles Churchill
The intuitive mind is a gift, and the rational mind is a faithful servant. But we have created a society that honors the servant and has forgotten the gift. (paraphrased) Albert Einstein
I come from a long line of sod busters, spanning back several centuries.
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