need help identifying leaf damage
 

Is this a deficiency of something? Or a pest problem....
It seems to only be a problem toward the bottom of the plants and it seems to be on all of the varieties I have.
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Looks more like sun scald to me. Cause is exposure to full sun before plants are fully hardened off. They will recover. Just remove damaged foliage

KarenO

It's imo not sun scald which is more white than yellow.
One spot is probably Early blight (not a very bad disease usually, but depends on region).
Also look under the leaves for spider mites (use a magnifier, they can be rather invisible, especially young).
If you grow outside some copper fungicide is pretty much necessary, unless your region is really dry. Of course, you can live with some disease, production will take a hit, but could still be ok. Experience will tell you what you can get away with in your garden.

Agree with fungal. The concentric rings show it to be early blight on the one large brown then yellow region.

[QUOTE=ginger2778;561617]Agree with fungal. The concentric rings show it to be early blight on the one large brown then yellow region.[/QUOTE]

So some copper fungicide should help then?

Amputate all infected leaves ASAP.

Worth

Ozone, I had early blight on my potatoes this year. It looked a lot like your leaves.

One question, did the cuttings come from a leaf section? Sometimes the leaf part turns colors when the rest of the plant looks fine.

[QUOTE=OzoneNY;561649]So some copper fungicide should help then?[/QUOTE]

Yes. Use at the weakest recommended mix for tomatoes, after you have trimmed off all affected leaves, and bagged them up, removed from garden. Note: stronger is not better with copper fungicide, it can cause new growth to curl and stunt and it takes 3 weeks for the plant to recover. It should have a blue color in the tank, but if your leaves have blue on them, it is too strong.

I will remove all the affected leaves tonight and bag it for the rubbish container. Is this related to the excessive rain we have had recently?

[QUOTE=OzoneNY;561688]I will remove all the affected leaves tonight and bag it for the rubbish container. Is this related to the excessive rain we have had recently?[/QUOTE]

Yes, it very likely is.

Agree with early blight and leaf removal. I've been using a combination spray of copper and mancozeb. It appears to me that it works in a similar way to daconil...coating the leaf surface so blights, etc can't. So far, pretty effective this year.