PEACH DISEASES 303 



result of frost-injury and other detrimental factors. It would 

 therefore appear essential that trees be given the best of care ; 

 they should be in a mature condition before winter. The 

 control measures involved in frost-injury are discussed on 

 page 43. 



Spores of the fungus are formed on all affected parts ; these 

 spores cause infections. It is therefore advisable that diseased 

 limbs and other parts be removed. Their destruction would 

 seem necessary on account of the ability of the fungus to live 

 as a saprophyte until such time as the trees are in a condition 

 favorable to attacks by the pathogene. 



It has been shown that spraying to protect susceptible parts 

 is not wholly reliable. However, the application of bordeaux 

 mixture and lime-sulfur to the bark greatly reduces the disease, 

 and is believed worthy of further trial. Fall and early spring 

 applications, when no foliage is present, are considered highly 

 desirable where the disease is troublesome. When spraying 

 for leaf-curl, San Jose scale or other enemies, the bark may be 

 coated for die-back. 



REFERENCES 



Rolfs, F. M. Winter killing of twigs, cankers, and sun scald of peach 

 trees. Missouri State Fruit Exp. Sta. Bui. 17 : 9-101. 1910. 



Rolfs, F. M. A disease of neglected peach trees. Missouri State 

 Bd. Hort. Rept. 2 : 278-283. 1908. 



GUMMOSIS 



Caused by various factors 



The term gummosis, gum-flow, is here used broadly to 

 indicate a sign of disease or injury rather than any specific 

 disease. Like other stone-fruits the peach is subject to a 

 gumming from trunk and branches as the result of almost 

 any kind of injury. The phenomenon has been observed since 

 man began to give attention to stone-fruit trees, and the trouble 



