AGRICULTURAL, EXPERIMENT STATION. 



Ill 



result. The vitality of the tree is lessened, and the effects are 

 accumulative, thus reducing the possibilities of future crops. 



The disease first ap- 

 pears on the leaves as 

 brownish or olive-col- 

 ored spots, as shown in 

 figure 2. These spots, 

 if numerous, run togeth- 

 er and finally become 

 blackish, and the leaf 

 tissue dies. The effect 

 Figure 2 Scab Spots on a Leaf. on younc foliage at- 



tacked early in the season, is well shown in figure 3.* The cut is 

 from a photograph taken in August and shows, on the left, a full 

 sized leaf which developed after the first attack of the fungus. If 

 the attack occurs later in the season, after the year's growth is 

 nearly completed, but little injury is wrought. 



vhk 



Fig. 3. Blighted Foliage. 



* The plates for figures 2 and 3, were loaned us by the Cornell University 

 Experiment Station. 



