New York Agricultural Experiment Station. 340 



This Maoroplioma resembles SpJimropsis malorum Pk., closely 

 in all respects except that the spores are hyaline, the spores of 

 SpUceropsis being dark, Saccardo even suggests that it may be 

 an immature stage of that fungus. But since the spores are 

 still hyaline when germination takes place and, after sufficient 

 growth, they in turn produce hyaline spores, there is no doubt 

 as to the distinction between the two species. 



Numerous inoculations were made in both apple and pear 

 trees with cultures of the Macrophoma from both of these hosts, 

 but in no instance were positive results secured. These experi- 

 ments should be repeated, however, before deciding that the 

 fungus is not parasitic. 



THE EUROPEAN CANKER. 



Mention is made in Bulletin 103 of the canker fungus, Nectrla 

 ditissima, which is a common and serious orchard disease in 

 many parts of Europe. N. cinnabarina is also mentioned as hav- 

 ing been found on quince trees in an orchard near Geneva and 

 an illustration is given of the injury that is produced. This 

 species is quite common in America, but is not regarded as being 

 particularly injurious. Up to this time the former species had 

 not been recorded as occurring on apple trees in America, but 

 during the past season specimens of apple limbs were received 

 at the Experiment Station which proved to be infected with 

 this fungus. ; • ■ ■..■^■-:.-\ ,,-. -.. --'r 



The following account of this disease is quoted from Science.^ 



" Shortly after Bulletin No. 163 of this Station, entitled 'A New York 

 Apple Tree Canker,' was distributed, the writer received specimens of dis- 

 eased apple limbs from various parts of the United States and Canada. 

 Among the rest was a specimen from Nova Scotia which was noticeably 

 different from any that I had yet seen. The injury was about six inches 

 long on a limb two inches In diameter. Within the diseased area was 



* Paddock, W. European Apple Tree Canker in America. Science, 12 : 

 297-299. 



