8" 

 St? 



NEW JERSEY 



Agricultural Experiment Stations 



BULLETIN 356 



October 1, 1921 



Recent Studies on Peach Yellows 

 and Little Peach 



M. A. Blake, Mel. T. Cook and C. H. Connors 



Introduction 



"Peach yellows" and "little peach" are peculiar American diseases 

 of the peach which have been responsible for heavy losses in many 

 localities in this and some other states. They are also said to occur 

 on nectarines, almonds and apricots and the same or very similar 

 diseases attack the plum. The term "yellows" is also applied to many 

 other plants when showing certain peculiar symptoms, more or less 

 similar to the symptoms of peach yellows, but we have no data en- 

 abling ns to determine whether they are the same or different. The 

 diseases are also supposed to be of the same general character as the 

 "mosaic" or "calico" diseases of tobacco, the mosaic of tomato and 

 pepper, the mosaic and "leaf roll" of potato and similar troubles on 

 oilier plants. 



The term "peach yellows" came into use early in the nineteenth 

 century and was used to describe a disease of the peach, which had its 

 origin in the lower part of the Delaware River valley some time dur- 

 ing the latter part of the eighteenth century. The importance of the 

 disease was very soon recognized and many methods have been sug- 

 gested and tried from time to time in order to eradicate or control it. 

 Symptoms similar to those characteristic of yellows may develop as a 

 result of other causes. Therefore, we have reason to believe that 

 many of the early records are incorrect and that many efforts for the 

 eradication or control of the disease have been unknowingly directed 

 at troubles due to other causes. 



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