Thank you both for your replies. Luckily so far none of the other tomatoes has been affected.
I'm still not entirely sure what it was, though Pythium myriotylum sounds like a possibility as it apparently can attack stems further up in humid and wet conditions.
Talking to other plot holders the best guess is that the pot for potting on wasn't cleaned properly. This is entirely possible - for next year I'll better clean them now rather than doing it impatiently on potting-on day....
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Tomato stem rot
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Some info and pictures here (from the States): https://ipm.ifas.ufl.edu/pdfs/Pythium.pdf
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Originally posted by Snoop Puss View PostI'm no expert on these matters, but might it be blackleg? I remember it being mentioned here a long time ago as affecting someone's tomato plants.
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I'm no expert on these matters, but might it be blackleg? I remember it being mentioned here a long time ago as affecting someone's tomato plants.
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Originally posted by ameno View PostTo be honest, I'd say that looks a lot like blight, if it weren't for the fact that none of the leaves seem infected. It doesn't make any sense for the stem to be so badly infected that it snaps before the leaves even show anything at all.
I've had blight occasionally before, but never before August. And then the stems never rotted so badly so quickly that they just snapped before I could bin them.
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To be honest, I'd say that looks a lot like blight, if it weren't for the fact that none of the leaves seem infected. It doesn't make any sense for the stem to be so badly infected that it snaps before the leaves even show anything at all.
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Tomato stem rot
Today I discovered that the stem on one of my Bloody Butcher tomatoes had completely rotted halfway up the plant. It has basically collapsed. Presumably a fungus, though it doesn't quite look like late blight, and it would be rather early for that.
Googling brought up Didymella stem rot, is someone able to confirm this diagnosis? It's not something I've come across.
Plant has been pulled and disposed of, and so far the others don't appear affected.
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