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Black stems on chilli plants

Hi there,
Noobie to gardening here... have grown chilli plants from seeds, and have noticed that I have black spots on the stems of my plants recently. All plants have been watered regularly but have started using tomorite recently, not sure if that has been rhe cause of the problem? Have had a couple of chilli peopera growing over the last week, but parts of the plant look like their dying! Have been advised that this may be blight, or a fungal infection, bu really don't know what I've done wrong here? Any help o advice would be greatly appreciated! Thank you in advance ☺
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Some chillis which produce dark coloured fruit also show coloration at the joints of the stems. Could it be that? From what I can see in the photo that’s what it looks like to me.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I've been growing peppers and chillies for years.
Just had a look at mine-
Both of my Jalapenos have the same marks, 5 of my 6 Corno di Toro Rosso peppers have it too.
None of my 5 Hotscotch chilies have it.
I don't know why some have these marks and others don't, but It's completely normal.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.