Hello
I have a slightly odd situation. I have around 30 tomato plants growing outdoors that are all doing well. Plot neighbours on both sides also no issues with their plants.
In my greenhouse I have 6 'mature' tomato plants. 4 of which have provided ripe tomatoes already (2 unknown varieties, green zebra and an Oxheart variety. The 4 that have provided ripe fruit have what looks like could be blight to me, the other 2 are ok. There are no marks on the stems or tomatoes themselves that I can see and top growth seems ok so I'm not sure. The plants are in pots with bought compost and I've only fed them once so wondering \ hoping if this could be nutrient deficiency. First time growing in pots and a greenhouse.
I have some smaller later tomato plants that are all unaffected so far and look much healthier.
Photos below: