What's this on my tomatoes?

in Fruit & veg
Hi All,
I'm a complete tomato growing novice and I need some advice please. A couple of my Amish Paste tomato plants have these yellow marks on their lower leaves and I don't know what's causing it. They look perfectly healthy otherwise. They're growing in the greenhouse. I'm hoping and praying that it isn't something serious.

I'm a complete tomato growing novice and I need some advice please. A couple of my Amish Paste tomato plants have these yellow marks on their lower leaves and I don't know what's causing it. They look perfectly healthy otherwise. They're growing in the greenhouse. I'm hoping and praying that it isn't something serious.

0
Posts
If the plants are fine otherwise, just keep going
I live in west central Scotland - not where that photo is...
If you think there's a problem in future, it helps to get a pic of the whole plant too, but if it's otherwise fine, I wouldn't be too worried at this stage.
Sometimes problems arise due to overfeeding, so as long as you're not doing that it should be fine. They don't need any food until the first truss of fruit is set.
I live in west central Scotland - not where that photo is...