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 José 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. Bul. 17:9-101. 1910. 
Rolfs, F. M. <A disease of neglected peach trees. Missouri State 
Bd. Hort. Rept. 2: 278-283. 1908. : 
GuUMMOSIS 
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 
