I can't see whether the mould on the stem has a fluffy grey appearance about it, which would indicate Botrytis (Grey Mould) which occurs when the humidity is too high, resulting condensation forming on the leaves at night and it is water on leaves which allows the fungus to take hold. The other possibility with that kind of stem damage is blight, unfortunately.
If you can provide more ventilation, it will help. I used to get a lot of it when I had a polytunnel but replaced that with a greenhouse which is much better ventilated. Fans can help a lot in structures where improving ventilation by adding vents is tricky or impossible.
A trowel in the hand is worth a thousand lost under a bush.
I've just been out to take a look at those cut pieces again. The stem isn't furry. It feels more or less like the rest of the stem, just a different colour. The leaves are dry and crunchy.
There seem to be a variety of different "not green" leaves etc and we're fearing blight, although that's not based on anything other than fear!
We did have some potatoes nearby which we suspected had blight.
So I've taken a bunch of photos - including a couple of the remnants of the potatoes - and uploaded them to Google Drive. If anyone can spare a moment, I wondered if you wouldn't mind taking a look to see if blight might be on the menu...
There seem to be a variety of different "not green" leaves etc and we're fearing blight, although that's not based on anything other than fear!
We did have some potatoes nearby which we suspected had blight.
So I've taken a bunch of photos - including a couple of the remnants of the potatoes - and uploaded them to Google Drive. If anyone can spare a moment, I wondered if you wouldn't mind taking a look to see if blight might be on the menu...
The second picture of potatoes looks like classic blight, but none of the tomatoes look like they have it, I see some leaf rolling which can be from excessive heat, to much fertiliser, not enough water or just the type of tomato, the purple is a nutritional deficiency of some sort but probably nothing to worry about at this point.
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I've just been out to take a look at those cut pieces again. The stem isn't furry. It feels more or less like the rest of the stem, just a different colour. The leaves are dry and crunchy.
There seem to be a variety of different "not green" leaves etc and we're fearing blight, although that's not based on anything other than fear!
We did have some potatoes nearby which we suspected had blight.
So I've taken a bunch of photos - including a couple of the remnants of the potatoes - and uploaded them to Google Drive. If anyone can spare a moment, I wondered if you wouldn't mind taking a look to see if blight might be on the menu...
https://drive.google.com/drive/folders/1fqr1soWaEBUgg4IxKQSRBiyMjB8YrdAx?usp=sharing
Many thanks
The second picture of potatoes looks like classic blight, but none of the tomatoes look like they have it, I see some leaf rolling which can be from excessive heat, to much fertiliser, not enough water or just the type of tomato, the purple is a nutritional deficiency of some sort but probably nothing to worry about at this point.