Septoria leaf spot on tomato plants, I think
Sorry I can't post a photo, but I did a search for "tomato diseases" and the yellow spots with black centers on the leaves look like the problem. Only my Early Girl plants have it, so I'm thinking the entire flat of 6 plants brought it with them.
Does anyone else in MA or RI have tomato plants with this? And if so, where did you buy your plants? (do a google search for "tomato diseases" then click on "septoria leaf spot" for info and pix)