66 



MANUAL OF FRUIT DISEASES 



one on the upper surface. At maturity the walls of the cup- 

 shaped structures split and recurve in a stellate manner. In 

 cases of severe infection the leaves turn yellow and fall. Some- 

 times 200 to 300 spots may occur on a single leaf. The diseased 



FIG. 18. Cedar-apples in winter condition. 



fruits are recognized by the presence of the cup-shaped fruit- 

 ing bodies which are usually aggregated at the calyx-end. Not 

 infrequently the lesions develop on the side or on the stem- 

 end. As previously noted the fruits are dwarfed as a result 

 of their being affected when they are young. Rust is rarely 



