Established Fruit Trees 



WHY TREES FAIL TO BEAR FRUIT. 



The chief causes of sterility together with sug- 

 gested remedies are : 



FIG. 16. (Top}. Silver Leaf of Fruit Trees. Winter 

 (fruiting] form of the fungus on dead plum branch. The 

 spores spread rapidly from these growths. (Bottom left] 

 Silver Leaf of Plum. Healthy branch on right; diseased 

 branch on left (summer form of disease}. To illustrate 

 Part II., Chapter II . (Bottom right) Silver Leaf of Fruit 

 Tree (winter form of fungus on dead plum branch). (Photo- 

 graphs by J. J. Green, B.Sc., and the Author.) 



i. Climatic. Damage by frosts and by cold winds. 

 In these cases the selection of suitable kinds and 



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