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 Myxosporium 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 

 necessary or profitable. 



REFERENCES ON SUPERFICIAL BARK-CANKER 



Edgerton, C. W. Two little known Myxosporiums. Ann. Myc. 



6 : 47-52. 1908. 

 Morse, W. J., and Lewis, C. E. Maine apple diseases. Myxosporium 



canker. Maine Agr. Exp. Sta. Bui. 185 : 373-374. 1910. 

 Lewis, C. E. Inoculation experiments with fungi associated with apple 



leaf spot and canker. Phytopath. 2 : 49-62. 1912. 



SPONGY 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 



