132 MANUAL OF FRUIT DISEASES 
bring about new infections during the growing-season. In 
the winter the fungus lives in the cankered bark. 
Control. 
The damage caused by Myzosporium corticolum is so slight 
that little attention need be given to its control. Frequent 
inquiries are made regarding its nature and treatment, but it 
is very doubtful whether any sort of remedial measures are ever 
, hecessary or profitable. 
REFERENCES ON SUPERFICIAL BARK-CANKER 
Edgerton, C. W. Two little known Myxosporiums. Ann. Myce. 
6: 47-52. 1908. 
Morse, W. J., and Lewis, C. E. Maine apple diseases. Myxosporium 
eanker. Maine Agr. Exp. Sta. Bul. 185 : 373-374. 1910. 
Lewis, C. E. Inoculation experiments with fungi associated with apple 
leaf spot and canker. Phytopath. 2: 49-62. 1912. 
Sponcy Dry-Rot 
Caused by Volutella fructi Stevens and Hall 
This disease was reported for the first time from North Caro- 
lina in 1907. Since that date it has been observed and recorded 
from several other states. It is common in New York on apples, 
but so far as known no other fruit is affected. There are no 
careful observations on record with respect to differences in the 
susceptibility of varieties. The disease is known as the spongy 
dry-rot and the Volutella-rot. The former name is usually 
given preference. 
Symptoms. — 
The affected area may involve a large portion of the fruit, 
although the lesions begin as small specks scattered over the 
surface (Fig. 35). Frequently rotten areas enlarge toward 
each other, finally fusing into large spots (Fig. 35, right). The 
younger portion of a diseased area is brown, but the older central 
portion is coal black. The surface of an affected area is dotted 
