APPLE DISEASES 49 



two characters serve to distinguish soft-rot from black-rot and 

 other apple-rots. 



The disease on the leaves is noticeable from a time shortly 

 following their unfolding to the end of the summer. One to 







V7 , 



FIG. 12. Leaf-spot of apple. 



several spots occur on a single leaf ; in the latter case the lesions 

 are scattered or grouped (Fig. 12). On the upper surface the 

 first evidence of this leaf-spot is a minute, purplish speck, 

 which soon enlarges until it attains a diameter of about one- 

 eighth of an inch. The spot later becomes yellowish brown, 

 circular, and definite ; in this stage the margin is elevated, and 



