CALIFORNIA CITRUS CULTURE. 



45 



fatal. When only small areas or branches are attacked, by cutting 

 out and painting with wax a cure may be effected. This, like gummosis, 

 is not contagious, though its nature and cause are not fully known. 

 This and mal di gomma described below may prove to be fungoid. 



FIG. 23. California scaly bark or psorosis on 

 orange. (After Fawcett.) 



Mal di Gomma Foot Rot. 



This is only met on water-logged, clay soils, and is often fatal if not 

 speedily treated. There is decay of the roots from the origin down, 



