New York Agkicultueal Expeeiment Station. 357 



horticulture respectively of Oregon, Washington and British 

 Columbia. These gentlemen sent specimens of diseased limbs 

 which upon examination were found to be attacked by an entirely 

 different fungus from the one that causes the ISTew York canker, 

 the spores were small, curved and hyaline while the spores of 

 Sphaeropsis are large, oval and dark bro^^^l in color. A liberal 

 number of specimens were received from each of the three sec- 

 tions and the fungus was the same in each case and so much in 

 evidence that there can be little doubt but that it is the cause of 

 the Pacific coast canker. Some of the specimens were submitted 

 to Prof. C. H. Peck, State botanist, who pronounced the fungus to 

 be a new species of Macrophoma. This disease because of its 

 destructive nature has attracted a great deal of attention for a 

 number of years in the Pacific Coast States, but no satisfactory 

 method of combating it has yet been found. Since entirely dif- 

 ferent climatic conditions obtain in that part of the country it is 

 not likely that the line of treatment recommended for combating 

 the New York apple canker will be effective against this disease 

 as it occurs on the Pacific coast. 



Fig. 1 of Plate XXXIII is from a photograph of an apple-tree 

 limb showing a typical specimen of the Pacific coast apple-tree 

 canker. 



THE EUROPEAN CANKER. 



Fig. 2 of Plate XXXIII shows a canker on a quince tree limb 

 which was produced by the fungus, Nectria cinnaharina (Tode.) 

 Fr. This shows what is known as the tubercularial or conidial 

 stage of the fungus; what appear as small white bodies in the 

 picture scattered over the surface of the dead bark, are brilliant 

 red or cinnabar colored stromata which bear the conidia or fruit- 

 ing bodies of one stage in the life history of the fungus. It will 

 be seen that the comparatively large size and brilliant color of the 

 stromata render the fungus conspicuous so that it is not easily 

 mistaken. 



