Tomato leaf spot
Some of my plants have it pretty bad.
I think I was also giving them too much water. It seemed to stunt their growth. So I lowered the water level and am starting to see new growth after a few days.
Here are some more organic treatments http://www.veggiegardener.com/12-homemade-natural-remedies-for-the-garden/
I’m also going to try my hand at making copper sulfate using these directions It seems simple and cheap.