This (crud) must be what my plants have. The tips of the first true leaves on my potato leaf plants (except Cowlick's) are dried, brown and curled. I also experienced it on my Danko plants. I wondered what it was since this is my first year starting seeds for potato leaf plants.
Per Carolyn's note above, I fall into the category of people who say "no" it doesn't spread from plant to plant (anyway, I haven't experienced it). I do agree with Tam91, cold weather seems to play a role. I first noticed it after I put my plants on the porch on a cool Spring day. The crud appeared to stabilize in the warm weather and only gets worse on cool days. However, it is still isolated to the first set of true leaves (primarily the tip of the leaf).
I haven't seen a picture of crud, so I am only going by the descriptions above and assuming it is what my plants have. I could be wrong.
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