U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 149. 



B. T. <i ALLOW AY. Chitf of Bureati 



DISEASES OF DECIDUOUS FOREST 



TREES. 



HERMANN VON SCHRENK, 



Formerly Expert in Charge of the Mississippi Valley 



Laboratory of the Bureau of Plant Industry, 



AND 



PERLEY SPAULDIXG, 

 Pathologist, Investigations in Forest Pathology. 



Issued June 30, 1909. 



WASHINGTON: 

 government printing OFFH ! 

 1909. 



