courette leaves are turning white!

please help - i grew them from seed, and planted them out two weeks ag
in the uk - the first week they thrived - tripled in size - now on leaf on evey plant is turning white - and on one plant it ha discoloured and totally shrivelled up! is this the sign of a frost havent seen? too much water? any ideas anyone?
yours in amateurish desparation
Dickpiggo
-- dickpiggot
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Probably a fungus, frost turns them black not white.
David
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