United Kingdom

I've got some Runner Bean and Cape Gooseberry seedlings which are developing white leaves. They were a nice deep green, but gradually are going white and papery thin, at which point they are almost see through. I can't see any obvious fungus or pests. Has anyone got any idea?? I know it sounds crazy, but having ruled out many possible causes I wonder if it is sunburn!!!

• 8 Jun, 2008

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