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damping off

• Message 1. 

  Posted by Swedboy (U14400604) on Monday, 9th April 2012

  Started out some seeds on my radiator a couple of weeks ago and all was fine. In the last couple of days seedlings have been starting to die. First the cucumbers and now the tomatoes. They have had short spells outside to prevent legginess. Could the stint outdoor caused this and should I try to move the health plants out of the pots. They all stand in the same water tray which might help spread the problem.

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• Message 2

  , in reply to message 1.

  Posted by kate1123 (U14824475) on Monday, 9th April 2012

  Once I move my plants out they tend to stay there as you are then subjecting them to large fluctuations in temperature. Outside 2-10 degrees, inside 10-18 degrees but in and out 2-18 degrees !
  
  What is your compost mix? I have 50/50 with sand for seedlings.

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• Message 3

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  Posted by Swedboy (U14400604) on Monday, 9th April 2012

  I tend to use 1:1:1 grit, worm compost and general compost. that usually works fine for me.
  
  The days the seedlings were out it was at least 10 plus. My flat is probably about 15 in the day I think. Moving them out was probably not my best move...
  
  What to do with the ones that are alive but have dying seedlings in the same pot? Move them out or start again?

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• Message 4

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  Posted by cufcskim (U14483815) on Monday, 9th April 2012

  The impression I get is that you're keeping them far too wet.

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• Message 5

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  Posted by kate1123 (U14824475) on Monday, 9th April 2012

  I am a bit concerned now, I would not be moving my seedlings outside until they had done at least a week in individual pots, I tend to keep them inside as long as possible.
  
  If you can pull out any dead seedlings and top dress with sand/grit/vermiculite. Or start again.

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• Message 6

  , in reply to message 5.

  Posted by thedogcody (U14659366) on Monday, 9th April 2012

  If seedlings are damping off then the compost is too wet and not free draining.
  
  My advice is to sow into a fresh propriety seed or multi-purpose compost -that will have been sterilised-using home made concoctions in my view is false economy,

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• Message 7

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  Posted by As-If (U15116884) on Monday, 9th April 2012

  Damping off indicates that at some point the seedlings have been both cold and wet at the same time.

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• Message 8

  , in reply to message 1.

  Posted by MIKEWW (U14827031) on Monday, 9th April 2012

  Hi Swedboy
  
  I have found there have been some huge swings of temperature in recent weeks which I have never experienced previously.For example in the greenhouse 0oC at night 38oC daytime in a propagator with the lid off 58oC !!! As a result I lost 2 trays of seedlings and a tray of over wintered fuchsia,s.
  
  So temperature swings may have been your problem.
  
  Regards
  
  MIke 14

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• Message 9

  , in reply to message 8.

  Posted by Swedboy (U14400604) on Monday, 9th April 2012

  Seems my attempt to give them a boost by taking them out in the sun might have killed them.
  
  I have moved the ones that are ok out of the collective tray to the window sill. Hopefully that will save them. Would be quite annoyed if they would die too. Especially since the peppers have germinated now.

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