I don't know how to create links here but just googling "coleus disease" yields the first reference I read entitled "New Disease in Coleus". Also, google images for coleus disease, or coleus virus, or coleus downy mildew are helpful references.
So I'm changing my buying stategies from buy only good looking coleus to buy only good looking coleus where all other coleus on premises continue to exhibit health for at least two weeks, and then quarantine any new stock brought home.
My days as a coleus rescuer have ended (sad face)
My Rosy Dawn order is beautiful and quarentined in their new pots with new soil for their own protection!
Judy