Posted: 10/07/2013 at 21:34
A white mist ?? Might be white powdery mildew.
Cucumbers are prone to getting this on their leaves at this time of year. You need better circulation and increased humidity inside the greenhouse using water and 2 sources of air-vents. If this has just appeared, spray leaves with diluted milk and water for a couple days.
I usually suffer from WPM but this year, I increased C & H and up till now...everythings perfect.
Curled leaves on tomatoes is ok, usually means at this time of year - too hot followed by cold. But do check for aphids, just to be sure.