Apr.l, 1912.] SOME APPLE DISEASES — TREATMENT. 



11 



scab, but often causes other- 

 wise perfect fruit to go as 

 seconds. It is found on 

 almost every varietj^ of 

 apple, but Baldwins and 

 Talman Sweets are espe- 

 cially susceptible. The dis- 

 ease appears about the 

 middle of August. At this 

 time it may be seen as 

 spots of a deeper red on 

 the colored surface of the 

 apple and of a darker green 

 on the lighter portion. As 

 the season advances, the 

 spots become more promi- 

 nent. They become slightly 

 sunken and more highly 



Fig. 9. — A section 

 corky cells beneath 



Fig. 10. 



A pycnidium of Phoma Pomi. The escaping spores 

 may be seen above. 



thru a Fruit Spot. The 

 the epidermis are shown 

 above, while below are 

 seen the brown and with- 

 ered cells produced :n the 

 later development of the 

 spot. The fungus can be 

 seen in the pocket in the 

 center. 



colored. (Frontis- 

 piece.) Numerous 

 black specks ap- 

 pear, sometimes 

 causing the center 

 of the spot to 

 have an almost 

 uniformly black 

 appearance (Fig. 

 8). The tissue 

 beneath the spot 

 is rendered brown 

 and corky to a 

 depth of several 

 cells (Fig. 9). 

 Cold storage 



