CHERRY DISEASES 181 



of Germany because of the severe injury inflicted on cherry 

 trees. In the United States both the wild and cultivated 

 cherries are affected. The reader is referred to Peach for 

 a description of the symptoms, cause and control, page 300. 



REFERENCE 



Wormald, H. The Cytospora disease of the cherry. . Southeast Agr. 

 Col. Wye Journ. 1912 : 367-380. 1914. 



BACTERIAL-GUMMOSIS 

 Caused by Bacterium Cerasi (Griffin) = Pseudomonas Cerasus Griffin 



The phenomenon of gum-flow is common to stone and citrus 

 fruit-trees. It results from stimulation produced by foreign 

 factors of one kind or another. The flow of gum, gumming, 

 or gummosis, is not a disease, although in many cases it is a 

 sign of disease. In other cases it is an indication of injury. 

 The term gummosis, then, is used broadly to designate any 

 disease or injury which is accompanied by a gumming, or a 

 flow of gum. The remarks presented here refer in most cases 

 to a particular bacterial disease of the cherry, plum, peach and 

 apricot which is commonly accompanied by gum-flow. So far 

 as is known at present this disease, called bacterial-gummosis 

 of cherry, occurs only in western Oregon and Washington. 

 Time may show, however, that this bacterial-gummosis prevails 

 in other sections of the United States. It is to be noted in 

 this connection that the flow of gum in the cherry in the states 

 already referred to is frequently caused by factors other than 

 the bacteria under consideration. In the Pacific Northwest 

 the disease is usually called cherry-gummosis, but the common 

 designation bacterial-gummosis is preferable in that it is more 

 specific. 



Among the plants affected by this disease the cherry is most 



