My son, in South Carolina, is losing his tomato plants to this condition in the picture. He's lost 7 already and has 11 left. Can any identify this condition and advise what to do to save the rest of his plants?
Need advice about this tomato problem
Check out this site and see if you think it's late blight.
http://aggie-horticulture.tamu.edu/publications/tomatoproblemsolver/leaf/