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Apple trees

Hello all,

I have some young apple trees which were started in the green house
recently.  The leaves have now become coated with a white powdery
substance and the leaves are starting to curl. 

Can anybody please tell me whether the trees have contracted some form
of disease, if so what it is, and also is there any chance of saving the
young trees?  None of the other plants in the greenhouse have been
affected and there is plenty of ventilation.

Thenks in advance,

Perry
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