DISEASES OF PLANTS SPRAYING 



251 



the fruits in some cases. The life of this disease is interesting, 

 and a knowledge of it leads to the proper remedy. 



The apple rust fungus lives a portion of its life upon the 

 apple tree or the quince tree, as already described, but it 

 appears in a very different form upon red cedar trees that 

 may be growing near the orchard. The growth on the cedar 

 tree is popularly known as cedar apple. These cedar apples 

 in spring appear as large masses of yellow or orange-colored 





FIG. 145. Twigs of peach in spring-time. Two at right affected with "yellows," 

 healthy twigs at left. (Experiment Station, N. J.) 



jelly clinging to the branches of the cedar tree; in winter they 

 are small, brown or purple galls. These enlarge next spring. 

 It is from these cedar apples that the disease spreads to the 

 orchard. 



If this disease is very prevalent in the orchard, it may be 

 best to remove the cedar trees near the orchard. This would 

 greatly check or stamp out the disease. Spraying as for 

 apple scab will perhaps aid a little in checking the apple rust, 

 but is not a complete remedy. 



