FIG. 2. THE DIE-BACK DISEASE OF FRUIT TREES. Portion of diseased 

 wood of Plum Tree showing pustular swellings caused by the fungus 

 Cytospora. The spores are extruded in damp weather from these 

 pustules in tihe form of minute, coiled threads of a reddish colour 

 (nat. size). 



41-1 



