CAUSE AND NATURE OF CROWN-GALL 



17 



When examined in April and later in September the tree 

 was still alive and appeared better than when treated. The 

 treatment seemed to have checked the rapid progress of the 

 disease, although it reappeared in several places during the 







• 





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Fig. i. — Five-year-old almond tree in the Glendale orchard, showing large galls 

 almost completely surrounding the crown a few inches below the surface. The earth 

 removed so as to expose the galls. 



fall. The crown was so weakened that the tree broke off at 

 the surface of the ground during a brisk wind the following 

 winter. 



No. 23. On examination a very small gall was found on the 

 northeast side of the crown of this tree. A small lateral root 



