Nasty disease?/fungus? taking over!

[Kinslet]

Hello, all!

I have run into what seems to be a growing problem this year. I am fairly new at gardening and cannot figure out what is going on with my plants. I am growing in grow boxes. I live in humid western NC and am trying to grow organically. So far I have only been using neem oil and de to control pests and disease, but clearly something isn't working. I am wondering if the humidity is causing it to spread even more. I am attaching pics of the plants that have been affected the worst. My tomatoes, some peppers, eggplants and beans have all been affected. Really worried my garden is too far gone. Any advice as to what this could be and how to control it would be greatly greatly appreciated! Thank you all!