U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY -BULLETIN No. 32. 



B. T. GALLOWAY, f/iiV/»/^urr.iii. 



A DISEASE OF THE WHITE ASH CAUSED BY 

 POLVPdIil'S FRAXINUPHILUS. 



BY 



HKRMANX ^'()^ SCHKENK. 



Special Agent in ('hak(ie of the Mississiimm Valley 



Lahoratorv. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued Fehkiary 2.S. 190.3. 



WASHINGTON: 

 government printing office. 



1903. 



