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. 
CoRYNEUM-BLIGHT 
Caused by Coryneum Beijerinckit Oudem. 
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 
