Tomato plant weird leaves

[CrazyConure]

My tomato plants are getting these weird leaves. What does it mean? Will it harm the plant? It seems to be spreading almost all the way to the top of the plant. The bottom has the worst of it. The plant is young.

 

[MoonShadows]

Looks like Septoria leaf spot. It is a fungal disease. It affects the leaves but not the fruit. It usually starts at the bottom of the plant and works it's way up.

here are some tips on treating. https://www.gardeningknowhow.com/edible/vegetables/tomato/septoria-leaf-spot.htm

 

[Chuck]

It is difficult to tell exactly what the problem is. It may very well be Septoria as @MoonShadows stated. Also the following link might be of help.
https://www.thespruce.com/tomato-leaf-diseases-1403409

 

[CrazyConure]

Thanks for identifying it. The images look exactly like my issue. After reading about treatments online, I went out and purchased copper fungicide. This is my first time buying a fungicide, so I’m excited to see the results. I’ll pay extra attention to not using more than directed, because it’s a bad habit of mine.

 

[DirtMechanic]

It can be challenging to use copper if the fungal pressures are high. I had to go to a product called Daconil in a more aggressive spraying effort.