PEACH DISEASES 311 



hibernating quarters for the bacteria. Careful pruning should 

 include the removal of diseased twigs, in order to destroy the 

 source of the inoculum. 



(4) The disease is bacterial, and the general rule that bac- 

 terial diseases are not directly controlled by spraying seems 

 to apply to black-spot. It has been found, however, that 

 spraying has an indirect effect in controlling disseminating 

 insects. A special schedule of applications is not warranted. 



(5) Orchards which are properly managed, i.e. properly 

 pruned, cultivated, fertilized and sprayed, invariably suffer 

 less than those otherwise handled. 



(6) The pathogene is spread in nursery stock, consequently 

 in planting new orchards use stock bought only from reliable 

 nurserymen. Younger trees suffer more within five years after 

 setting than do older trees that are in good condition. 



REFERENCES 



Rolfs, F. M. A bacterial disease of stone fruits. Cornell Univ. Agr. 



Exp. Sta. Memoir, 8 : 381-436. 1915. 

 Rorer, J. B. A bacterial disease of the peach. Mycologia, 1 : 23-27. 



1909. 



COR YNEUM-B LIGHT 

 Caused by Coryneum Beijerinckii Oudem. 



| v The disease here discussed is known commonly as California 

 peach-blight, blight, shot-hole, fruit-spot, and sometimes as 

 brown-spot, pustular-spot and winter-blight.' "The earliest 

 record of it comes from France in 1843. In recent years, 

 particularly from 1905 to 1907, the disease was the subject 

 of considerable comment in California. The first report of 

 it from that State dates back only to 1900, although doubtless 

 the parasite had been there for many years prior to that time. 

 It was first observed in Michigan peach orchards in 1893, and 

 subsequently has been seen in Indiana, Oregon, Ohio and New 



