U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 36. 



B. T. GALLOWAY, Chief of Bureau. 



THE '' BLUING" AND THE -'RED ROT" OF THE WESTERN 



YELLOAV PINE,. WITH SPECIAL REFERENCE TO 



THE BLACK HILLS FOREST RESERVE. 



BY 



HERMANN VON SCHRENK, 



Special, Agent in Charge of the Mississippi Valley 



Laboratory. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL INVESTIGATIONS. 



Issued May 5, 1903. 



NEW YORK 



B0TAN5CAL 



GARDEN 



WASHINGTON: 

 goyernment printing office. 



1903. 



