Three 1-yr seedlings: white, fine, gritty fungus on leaf undersides, spreading from edge inward, killing leaves. Copper fungicide soak limited success. Rare plant, little info.
Delicate, spores only on undersides. Needs microscope/hand lens to confirm.
Take affected leaves to garden center for magnification exam. Google "downy mildew" for comparison.
Expert insight provided by Steve.
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