PLATE 56 



Prunus leaves from inoculation series 104 (Table II), infected by strains of Coc- 



comyces from P. cerasus: 



A. — P. cerasifera, infected after prolonged incubation in the greenhouse. 



B. — P. insititia, infected after prolonged incubation in the greenhouse. 



C. — P. mahaleb. 



D. — P. munsoniana, inoculated with naturally discharged ascospores on June 2; 

 photographed on July 19. The infection appeared after prolonged incubation in the 

 greenhouse. 



E. — P- domestica. Spots developed after prolonged incubation in the greenhouse, 

 but the fungus failed to fructify. 

 56113°— 18 4 



