o> DEPARTMENT OF AGRICULTURE. 
BUREAU OF PLANT INDUSTRY—BULLETIN NO. 280. 
B. T. GALLOWAY, Chief of Bureau. 
THE “ROUGH-BARK™ DISEASE OF THE 
YELLOW NEWTOWN APPLE. 
BY 
JOHN W. ROBERTS, 
Assistant Pathologist, Fruit-Disease Investigations. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1913. 
