Gardener Posted May 24, 2011 Share Posted May 24, 2011 Is there one? Don't like to spray my potatoes blue more often that I have to. Link to comment Share on other sites More sharing options...
andyh4 Posted May 24, 2011 Share Posted May 24, 2011 If the temperatures are above around 16° you won't get blight. It thrives in cool damp conditions, and that is not a description for my bit of France just now. Link to comment Share on other sites More sharing options...
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