APPLE DISEASES 81 



REFERENCES ON BLISTER-CANKER 



Hasselbring, H. Canker of apple trees. Illinois Agr. Exp. Sta. Bui. 



70 : 225-239. 1902. 

 Gloyer, W. O. Apple blister canker and methods of treatment. 



Ohio Agr. Exp. Sta. Circ. 125 : 149-161. 1912. 

 Pammel, L. H., and King, C. M. Four new fungous diseases in Iowa. 



The blister canker of the apple or Illinois canker (Nummularia 



discrete, Tul.). Iowa Agr. Exp. Sta. Bui. 131 : 212-215. 1912. 



NORTHWESTERN ANTHRACNOSE 

 Caused by Neofabrcea Malicorticis (Cordley) Jackson 



This is a disease peculiar to the Pacific Northwest. In 

 consequence of this fact it is often called Pacific Coast canker 

 and Northwestern apple-tree anthracnose. It is known to 

 occur most abundantly in the states of Washington and Ore- 

 gon. It is not recorded in California, although it probably is 

 present in the northern part of that state. It was once re- 

 ported as far east as Nebraska, but the disease is unknown in 

 any section of the United States other than that already indi- 

 cated. Outside of the United States it is found only in British 

 Columbia. It is believed that the apple-tree anthracnose 

 originated somewhere within its present geographical range 

 on some native host. It did not begin to attract serious atten- 

 tion on the apple, however, until 1891. Since that time its 

 ravages have increased until in the Northwest the anthracnose 

 is second in importance only to apple-scab. It is most serious 

 in those regions west of the Cascade Mountains, where con- 

 siderable rainfall occurs. It is rarely serious in eastern Oregon. 



On account of the nature of the injury the amount of the 

 losses is difficult to estimate. The twigs, sometimes the larger 

 branches, and even the trunks of young trees are likely to be 

 girdled. A single tree may show from one to more than one 

 hundred cankers varying in length from one-fpurth to six 



