Some of the 'Maters aren't doing well

[nanzi]

We have 2-3 tomato plants that are wilting, and the leaves are turning
yellow, whilst the others are just fine. And I do mean tomatoes, they
are both cherry tomato plants that we have had produce beaucoup
'maters in the past. We plant em cuz the grandsons love to eat them
right out of the garden. And they are so sweetin salads. All the
fulsize maters are fine and producing normally. Have never had this
problem in the past. I know the description is pretty vague,
but .....any ideas?? None of our cherries look as vigorous as in the
past. Not half as much foliage. Think they need nitrogen?
Thanks.
Nanzi

 

[Grow 4 Food]

Turning yellow, maybe too much water? Is the size of the plant about the same just not as many leaves? Might be a fertilizer issue but I am assuming that they get just as much as the larger plants do?

I am sure other will have comments.

 

[OaklandCityFarmer]

Are the plants that are being affected close together? It could be the onset of a fungal/viral infection.

Are the older bottom leaves the ones being affected? Also, have you noticed any discoloring of the leaves other than yellowing? Or in the veins?