This section is from the book "Manual Of Fruit Diseases", by Lex R. Hesler. Also available from Amazon: Manual Of Fruit Diseases.
The apricot is not infrequently affected by Silver Leaf. The diseased trees are recognized by the peculiar ashen - gray color of their leaves. Accompanying this symptom is the production of little or no fruit. (For full discussion see Plum, page 368.)

Fig. 44. - Black Spot on apricot leaf.
 
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