=1-6 • N. J. Agricultural Experiment Stations Bulletin 356 



are. frequently smaller than normal leaves. They vary from light 

 green in color to a yellowish mottled green. Such leaves often show 

 a lighter and yellower green than normal leaves and a reddish margin. 

 This appearance of the foliage is quite distinct from the dropping and 

 flaccid condition of leaves upon trees suffering from drought. Young 



n>- . •* .»•»"** 



Fig. 7— Yellows Shoot Upon Cut Back Tree Holding Foliage in- 

 Early Winter. Peach Tree in Advanced Stage of Yellows 



trees affected with this disease are usually somewhat checked in 

 growth and assume a more upright and less spreading habit than 

 normal trees. 



Rolling of the Leaves 



In some instances the first indication of yellows is a rolling of the 

 foliage from the margin inward, giving the leaves a rounded or pencil 

 shape; the lenticels of the bark also are much enlarged. These may 

 be the only symptoms on young trees and the first symptoms on older 

 trees. These symptoms are brought about also by any factor which 

 interferes with the circulation of the sap in the tree, such as girdling 

 in 'any form, winter injury at the collar, borer injury and damage by 



