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Black leaves on broad beans

• Message 1. 

  Posted by BexForster (U15089756) on Tuesday, 14th February 2012

  Hi
  
  I planted my broad beans in October and they seem to be dying and have black leaves. New growth is green but the older leaves and parts of stem are black and they are wilting and looking very sad. Do you think they are salvagable or have any ideas what causing it? Saw couple little black flies on some but nothing major. Didn't know whether to cut off as much of the black as I can and hope they recover? Help!!!
  Thanks

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• Message 2

  , in reply to message 1.

  Posted by johntheeng (U12092015) on Tuesday, 14th February 2012

  Could it be that the frost has got them? Its been very cold of late. I have only just sown mine and they are in a cold greenhouse and will only be planted out later when they will not get such cold spell as lately.

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• Message 3

  , in reply to message 2.

  Posted by BexForster (U15089756) on Tuesday, 14th February 2012

  Maybe but prior to the really bad weather they had started looking sorry for themselves and few black leaves were appearing...they are Aquadulce Claudia which are for overwintering so thought would be ok?

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• Message 4

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  Posted by Swedboy (U14400604) on Wednesday, 15th February 2012

  I'd guess that it is due to frost. My field beans that I plant as green manure has developed black spots after the frost and I think one or two might even have died. Strangely enough they didn't do this last year which was much colder!

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• Message 5

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  Posted by hereisabee (U2342191) on Friday, 17th February 2012

  Yes I grow this variety every year and always save my own seed. The point is you have sowed too early, ideally they should just germinate and poke through the soil. At this stage they will take all the bad weather that can happen, as they grow larger they draw in more water and become more prone to damage by frost. This year wait untill November before sowing, even if the weather then goes very cold the seeds will be okay and germinate as conditions improve.
  
  
  
  This photo is from 2009 and the beans are a bit larger than ideal, however the Jan/Feb weather was mild and they went on to produce a good crop.

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• Message 6

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  Posted by hereisabee (U2342191) on Sunday, 19th February 2012

  I have just returned from the allotment and have some fresh photos.
  
  This is a bean that has caught the frost
  
  
  However planted later, these are much smaller and have no damage. Clearly the anti-freeze chemical is rich within the seed and as the plant grows larger becomes less effective.
  
  
  Yet there are exceptions, some of the larger beans do escape frost damage and could be called 'heros' in Darwin language - good for saving seed from?
  

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• Message 7

  , in reply to message 1.

  Posted by Kleftiwallah (U13700999) on Tuesday, 21st February 2012

  
  Bet my black leaves are blacker than your black leaves ! ! !
  
  I'm leaving mine to get on with it. Cheers, Tony.

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• Message 8

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  Posted by hereisabee (U2342191) on Tuesday, 21st February 2012

  Yes they will all grow and flower, some I dig in as a green manure, some I pick as green beans and fill the freezer with, and some I leave alone and harvest as seed. There is an expression called Landrace which is where seeds are grown and harvested to become a local strain.

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• Message 9

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  Posted by sampson25 (U14632533) on Wednesday, 22nd February 2012

  I didn't start my broad beans, also Aqua Dulce, until November, but as it was so mild here in the South East, they germinated v quickly and were much bigger than I'd planned when they got hit by frost in Feb. when I looked at them yesterday they had new growth at the bottom. I have cut back to this and will see what happens.
  
  In the meanwhile I've just started another lot off in my cold frame.
  
  Sally
  

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