SOME DISEASES OF TREES IN GREATER 

 NEW YORK 



Arthur Harmount Graves 

 (With Plate io, Containing 4 Figures) 



In the course of field work carried on by the writer in Greater 

 New York and the adjacent parts of New Jersey in the summer 

 of 1918, several diseases of forest trees were incidentally studied : 

 those selected for the present paper are important on account of 

 their destructiveness, or interesting by reason of their rarity, or 

 demand attention because they are little understood and need 

 further investigation. A few notes on injury from the extremel}^ 

 disastrous winter of 1917-1918 are added. 



The writer wishes to acknowledge his indebtedness to the 

 many persons, some of them named in the text of this paper, who 

 have contributed information or assistance toward its prepara- 

 tion; and to the botanical staff of Yale University for generously 

 placing the Osborn Botanical Laboratory at his disposal for the 

 culture and microscopic work involved. 



The diseases are arranged according to host species, the 

 sequence of hosts following that of Sudworth's Check List of the 

 Forest Trees of the United States.^ 



L Bark Disease of the Butternut {Jiiglans cinerea L.) 



Almost without exception the mature butternut trees in the 

 region surveyed were in a moribund condition, sometimes only a 

 few of the smaller branches being dead, while in extreme cases 

 the entire tree had succumbed. Usually the disease appeared to 

 commence on the branches, both those at the top of the tree as 

 well as at the sides of the trunk being affected. During the death 

 of the distal portion of a branch another would develop further 



1 Sudworth, George B. Check list of the forest trees of the United States. 

 U. S. Dept. Agr., Forest Service Bui. 17: 1-144. 1898. 



Ill 



