Tomato leaves yellow with green veins

Los Gatos, CA

I am growing tomatoes and other vegetables on my deck in pots. The leaves on two tomato plants and one tomatillo plant have turned yellow but the veins remain green. A third looks like it might be developing the same problem. I have checked the PH and it is about 6.5. I live in the Santa Cruz mountains in California. I use Miracle Grow for tomatoes as a fertilizer. I have also tried a foliar spray of epsom salt because I thought it might be magnesium deficiency. Any ideas? I would hate to lose them. They have tons of tomatoes on the vines and are 6' tall! Thanks for any help you can give me.

Thumbnail by caesarjr Thumbnail by caesarjr Thumbnail by caesarjr Thumbnail by caesarjr Thumbnail by caesarjr
Los Angeles, CA

Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to Peronosporaceae.

https://lifeandagri.com/pest-and-diseases-of-family-cucurbits/

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