I assume you meant to post this on the Vegetable Gardening forum rather than here? It appears to be a severe nutrient deficiency given all the interveinal chlorosis.

Dave

Yes I posted here accidentally. But thank you for the response. I was starting to worry it was blight. Here is another photo if another leaf.

What potting mix is it growing in?

What fertilizer are you using?

Are you using softened water?

Any chance of a photo of an entire plant?

Probably they've got Downy Mildew.

Here is the plant. I used coast of Maine potting mix and quodyy compost. Also earth worm castings. But I haven't fertilized in a few weeks.