Black spots taking over plants (Pictures)

[pure-krypton]

Hi guys newbie here.
I'm getting worried something is happening to my tomato plants.

Any advice would be great.

[Juliuskitty]

Hi guys newbie here.
I'm getting worried something is happening to my tomato plants.

Any advice would be great.

I am not sure, but looks like a fungal infection. Here are my suggestions: Try to spray with Daconil thoroughly, under, over the leaves, and stem. Mix according to directions, not stronger. Then trim off all the yellowed and spotted leaves. Wipe down the trimming tool with bleach solution before it touches another plant so as not to spread the infection. Dispose of the infected leaves.
I would also spray with a copper fungicide 4 days to 1 week later, then once per week and after heavy rains. I learned the hard way, don't mix the two!!
What is your location? Are you in a humid area? Have you had recent rains? Youcan put your location in your profile and it will help people in diagnosing problems.

Hope this helps you.