Some of the leaves on one of my new tomato plants have started showing small black spots. The tomato plant is growing in a hydroponic setup (Dutch bucket) outdoors in southern California.
The plant has been bearing fruit and looks to be in great condition aside from these new spots. I have seen pictures of septoria, and from what I can tell, the septoria spots look to be brown/black/yellow, with colors kind of fading out from the center. In addition, most of the leaves infected with septoria also look like they are yellowing/curling at the edges. They just look like bad leaves in general.
The thing that has me confused is that my leaf looks A+ aside from these black polka dots everywhere! Why are my leaves polka dotted?