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Broad beans and chocolate spot
I've got something on the broad beans that I assume is chocolate spot. Not all of them have it, but the ones in the middle of the row are worst affected.
Apparantly the causes are too much nitrogen (we used up some old Gromore and it was all caked, so the dose was probably wrong - and we shouldn't have been using a fertiliser with nitrogen on broad beans in any case...) and poor air circulation.
I've removed the worst affected plants as it didn't look as though they'd produce any beans anyway. I've left those that have at least one pod forming.
The good news is that we are getting some beans and they tasted really good when we ate them a couple of days ago. I'm looking forward to picking some more shortly.
The most curious thing about the chocolate spot is that the affected plants seem to have had a major die-off of blackfly. I can see lots of places where blackfly were and no longer are. Anyone care to guess why that should be?
Does anyone know if I should be removing the other diseased plants, or is it okay to leave them and hope to get beans from them?
Apparantly the causes are too much nitrogen (we used up some old Gromore and it was all caked, so the dose was probably wrong - and we shouldn't have been using a fertiliser with nitrogen on broad beans in any case...) and poor air circulation.
I've removed the worst affected plants as it didn't look as though they'd produce any beans anyway. I've left those that have at least one pod forming.
The good news is that we are getting some beans and they tasted really good when we ate them a couple of days ago. I'm looking forward to picking some more shortly.
The most curious thing about the chocolate spot is that the affected plants seem to have had a major die-off of blackfly. I can see lots of places where blackfly were and no longer are. Anyone care to guess why that should be?
Does anyone know if I should be removing the other diseased plants, or is it okay to leave them and hope to get beans from them?
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As for removing them: I don't see how other plants can catch anything from them, as the problem is caused by the nitrogen and not by some lice. Having removed the worst affected plants should also have improved the air circulation. So leaving the remaining ones should be okay. But once again, I'm just guessing.