DISEASES OF PLANTS— SPRAYING 



229 



even to the fruits in some cases. The Hfe 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 alTecteci 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. 



