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 



YELLOW PINE, WITH SPECIAL REFERENCE TO 



THE BLACK HILLS FOREST RESERVE. 



BY 



HERMANN VON SCHRENK, 

 '/ 



SPECIAL AGENT IN CHABGE OF THE MISSISSIPPI VALLEY 

 LABORATORY, 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL INVESTIGATIONS. 



ISSUED MAY 5, 1903. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1903. 



