I'm growing about 10 different heirloom tomatoes in buckets and I'm starting to have some problems on 1 or 2 plants. Its starting on the bottom leaves and looks like it might be spreading up. im not sure if its a disease or nutrient burn or deficiency.
Overall the plants look healthy they are putting out flowers and branching out. i just want to make sure the problem dosen't spread.
Here is a link that might be useful: Pictures