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 
Fic. 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 
E 
