Problem is and most likely always was in the soil. Get two new plants and in the meantime pot them in 5 gallon pails full of bagged mix, drill some decent drainage holes in the bottom. Grow them in that this year.
Did you check out the link with plant pathology photos? Which do you think your plant most closely represents?
If you want to risk planting them, put down plastic mulch. The mulch keeps the soil from splashing onto the leaves. That is usually the route of transmission.
I'll look at my books later tonight and see if I can give you a better answer.
Copper (sulfide? sulfate?) is often used for fungus.
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And now I'm finished posting.
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