MICHIGAN ACADEMY OF SCIENCE. .133 



Several tree diseases are discussed brieHy. Chestnut bark dis- 

 ease has not been found in tlie state. Maple anthracnose and leaf 

 scorch are contrasted. The Phyllosticta disease of horse-chestnut 

 has attracted much attention but it is not known to bo serious. 

 These foliaj;e diseases by the suddenness of their attack and the 

 striking;- effect upon the foliage have aroused nnich more interest 

 than the heart rots Avhich, in maple especially, may safely be pre- 

 dicted to be so serious, that in from 15 to 25 years, all the present 

 mature trees will be dead or rendered Avorthless. 



The diseases which are here described as new are at present under 

 study at the laboratory and future publications are promised. 



April, 1915, East Lansing. 



