Hello,

I found that for the last weeks leaves are getting yellow and got sports on them. What is it and how to fix it?

Have they just recently been moved outside? It looks like some sun and wind burn.

Don't know if this will help or not, but you can do some comparisons:

https://aggie-horticulture.tamu.edu/veg ... leaf-spot/

Two other good sites for disease, pest & physiological tomato problems are:
https://plantvillage.psu.edu/topics/tom ... ropagation and
https://hgic.clemson.edu/factsheet/toma ... disorders/.

I agree with [mention]Cole_Robbie[/mention] -- some of your pictures seem to show sunburn on the leaves, especially pictures 1 and 4. Did you put the plants in the sun for the first time recently, or in brighter sun/hotter conditions, or for a longer period of time? It does look like maybe the plants went outside recently, because it looks like the pots have pollen things (very scientific term!) on top of the dirt. If new leaves emerge and look fine, it's probably just sunburn.

Pictures 3 and 5 seem different, but it's hard to tell.

If you don't think it's sunburn, maybe post additional pictures and tell us more about how you're growing the plants and what you did before these symptoms appeared.

Most likely, your problems will go away once you put the plants in the ground, as long as you harden them off before planting, and give them the recommended amount of fertilizer at planting time.

Pretty sure Cole is right.
I would just pinch off those damaged parts, so they don't become a source of decay around the plant, which is otherwise healthy.

The second-to-last photo reminds me of this Q/A on StackExchange:
https://gardening.stackexchange.com/que ... ato-leaves

If the answer there is correct, that goes along with what Cole_Robbie was saying, with the additional insight that perhaps the leaves have become wet when the sun was out strongly. I've never personally had a problem with that happening with wet leaves, but I've heard other people report similar stuff. Maybe some kinds of water are more of a problem than others. Wet leaves can encourage fungus, though--so, either way, unless the humidity happens to be pretty low consistently, I would recommend avoiding spraying the leaves, especially if it results in foliar issues.

If you're doing foliar feeding or some such, be sure to do it when the sun isn't strong.