Al'PENDIX. 405 



APPLE-TREE ANTHRA(;N0SE. 



ny I*H(il''. A. |{. ('<>I!I)1,KY. 

 SOMK PUKLIMINAKV NOTKS. 



These few notes are issued to c-all the alt cut ion of growers to a serious 

 disease of apple trees: to indicate llic nature of the disease and liovv it is 

 proi)a^ated ; and to suj^^esti methods for its eontrol. 



The disease is new only in tlie sense that its cause lias uevi-r Ijei'ore been 

 described. For several years past the api)le orchards of the Paciiic North- 

 west, including Western Oregon, Washington, and British Columbia, have 

 suffered more or less seriously from the attaclvs of this disease which has 

 been known locally as "canker," " dead spot, " or "black spot."' In fact the 

 ravages of the disease have been so serious the past season that persons 

 j)rominent in horticultural affairs have expressed the conviction that the 

 aj)] lie-grow ini^- itidusti-y of the above mentioned regions is threatened with 

 destruction. While not in any sense agreeing with this i)essimistic view, 

 we realize that the disease is a serious one, and, several months ago, under- 

 took the problem of discovering its cause, and, if possible, a satisfactory 

 remedy for it. As a result of our work up to the present time tlie lirst 

 problem has been solveil, and, we believe, we can offer a reasonably satis- 

 factory solution of the second. 



AN UNDESCKlHi:i) DISKASK. 



Although of considerable importance, the disease seems to have been 

 almost entirely overlooked, and nothing of impoi'tanee (roncerniug its luiture 

 has been published. Some nutnths ago Mr. Paddock of the New York 

 Experiment Station, at (ieneva, discovered that a fungus which causes the 

 well-known "black rot'" of apples and quinces, is also the cause of a disease 

 of apple bark which he named "canker." At the time we were in hopes 

 that Mr. Paddock"s discoveries would ex])lain the cause of our Somewhat 

 similar western disease, but only a cursory examination was needed to show 

 that this is not the case: and recently 1 have had, with Mr. Paddock, the 

 privilege of comparing the two diseases, with the result that we were both 

 convinced that they are entirely distinct. Further study also convinced me 

 that the disease is a new one and that it is caused by an undes(!ribed species 

 of fungus for which I have proposed tlie name Glocaporiimi DuiUcorticLs. 



COMMON NAME OK TIIK DIRIOASE. 



As Stated above the disease has been Icnown lot-ally as "canker,"' "dead 

 spot," and "black s])ot," Ordinarily it is best to accept a common name 

 when once established in a locality, but in this particular instance we 

 believe that confusion in the designation of the disease in future can best be 



