Q.What is wrong with my tomato plants?
Hi! I’m growing some Roma tomatoes in a container (first time!) and the plants have recently started developing some spots on the lower leaves. I can not tell what it is, even with the many articles, they all look so similar! I would like to know if you can help me figure it out so that I can hopefully stop this from getting worse!
This looks like Septoria leaf spot.
Remove the leaves and dispose of them to avoid spreading this fungus.
These links will help you.
http://msue.anr.msu.edu/news/septoria_leaf_spot_on_tomatoes_preventing_spots_before_your_eyes
https://www.gardeningknowhow.com/edible/vegetables/tomato/septoria-leaf-spot.htm