132 ILLINOIS STATE ACADEMY OF SCIENCE 



many pycnidia were observed which upon examination 

 proved to be these of Phomopsis mali. A fresh lot of 

 specimens were later received. These showed the same 

 rough character of the bark, but the type of injury on 

 these larger branches resembled more nearly the rough 

 bands produced by the blotch fungus (PhyUosticta soli- 

 taria). Scale was also evident on two branches, and 

 since scale produces a rough bark similar to that of both 

 blotch and the true rough bark disease it is apparent 

 that some doubt might arise as to the true cause of this 

 condition. 



PJiompsis mall has twice been obtained on apple twigs 

 kept in moist chambers and a number of times on 

 blotched limbs so that it seems to be a fairly common 

 fungus. 



An examination of Mr. Wemper's tree showed the 

 presence of numerous active blotch cankers on the young 

 twigs so that there seems little doubt but that the rough 

 bark condition was produced by Pliyllost'icta solitaria 

 and not by Phomopsis mali. If Phomophsis mali were an 

 active parasite under Illinois conditions it is apparent 

 that it would have caused serious trouble on account of 

 its general distribution. The mere presence of this fun- 

 gus on rough bark is not sufficient evidence, therefore, 

 that the diseased condition is due to this organism. 



CHIXA ASTEK 



Leaf spot {Septorio callistephi Gloyer). Destructive 

 blighting of the lower leaves of seedling plants of the 

 china aster {CalUstephus chinensis Nees) was observed 

 in the University floricultural greenhouses in the spring 

 of 1921. Many of the plants were so stunted as to be 

 worthless. After the plants were set in the field the 

 disease gradually disappeared. This was aided no doubt 

 by the dry hot weather of June and July. Collections 

 were made of the leaf spot and a microscopic examina- 

 tion showed that the disease was due to a Septoria. 



Gloyer (Phytopath. 11: 50, 51, 1921) describes a new 

 species of Septoria on China aster from New York which 



