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Powdery Mildew confusion

• Message 1. 

  Posted by aldaniti (U14803108) on Tuesday, 21st June 2011

  I came home yesterday after a few days away to find my lemon apple cucumber has powdery mildew, I had a dig around the net to find a treatment & found quite a few using milk, so 1 part milk/9 parts water/ 2tsps Bicarb were added to spayer, plant was soak with solution around 10am & it stayed dry until rain in the evening, its growing in a large pot against a south facing fence,
  
  Whilst reading about it I had noticed that some sites said it was caused by hot dry weather yet others said wet weather
  
  Can anyone clarify this? also has anyone tried the molk treatment?

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• Message 2

  , in reply to message 1.

  Posted by aldaniti (U14803108) on Tuesday, 21st June 2011

  That should be milk not molk treatment!
  
  I also added a tiny drop of washing up liquid as a wetting agent

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• Message 3

  , in reply to message 2.

  Posted by Italophile (U12516505) on Tuesday, 21st June 2011

  Dampness, humidity and lack of air circulation usually contribute to powdery mildew. The recipe you found is a common one. The bicarb is said to create a pH on the leaf surface that the spores can't handle. No one quite knows why milk is involved but it is and has been for a long time.

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