270 MANUAL OF FRUIT DISEASES 
Peach-yellows, and similar diseases, like rosette and little- 
peach, are best known because of their destructiveness and 
obscure causal nature. The best authorities gave up the 
unsolved problem of their causes several years ago. And to- 
day these troubles remain in obscurity, at least in this respect. 
Control measures for these diseases are therefore - puzzling 
and ineffective. In many localities peach-yellows is the most 
dreaded of all peach enemies. But for the whole United 
States brown-rot and leaf-curl are the most important diseases. 
Brown-Rot 
Caused by Sclerotinia cinerea (Bon.) Schrot. 
This disease, which is called brown-rot of stone-fruits, mold, 
blossom-blight, twig-blight, peach-rot, brown-rot canker and 
other names, was not given serious consideration in America 
prior to 1881. It is now a well-known fungous trouble wherever 
the peach is grown, both in Europe and in the United States. 
The pathogene causing brown-rot probably came from some 
foreign country. History shows that the disease has been 
more serious in some years than others in America. In 1887 
it attracted no little attention in Maryland and Delaware. 
In 1891, 1893, and during subsequent years brown-rot has been 
of considerable importance in the Delaware and Chesapeake 
peninsula. Alabama growers experienced a severe epiphytotic 
in 1897, while in 1900 the disease was the most. conspicuous 
and the most destructive in Georgia since the beginning of 
stone-fruit culture in that state. 
Brown-rot is most prevalent and most destructive in the 
warmer peach-growing states, such as have already been 
enumerated. In warm, wet seasons the trouble is severe in 
the northern states. The light-colored varieties are generally 
regarded as the most susceptible. Those showing least rot 
