Disease ID Help Please - Pics Attached
Can anyone please help me identify this disease? I have four plants in my raised bed garden in Denver, they were growing great until I noticed a few leaves with purple/gray spots. The biggest ones are 6-7' tall already, and I just picked my first few full size tomatoes. Seems to be present mostly on my Big Boy plant. Any ideas of what it is, and if it can be treated? Thanks!