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Silvery spots on tomato leaves

Can someone help identify this problem please? I have 12 tomato plants in a greenhouse and an increasing number are affected by silvery white/ light tan, almost pearlescent spots on the lower leaves but spreading upwards. The affected leaves are very slightly wilted. It is as if the green part of the leaf has been removed, leaving non pigmented leaf behind. I can see no powdery residue, and both sides of the leaves are similarly affected. I ventilate the greenhouse daily and put a little water on the floor in the morning when it's hot.


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