U.S. DEPARTMENT OF AGRICULTURE. 



BUREAU OP PLANT INDUSTRY -BULLETIN NO. 44. 



B. T. G ALLOW AY, Chief of Bureau. 



THE BITTER ROT OF APPLES, 



HERMANN VON SCHRENK, 



Special Agent in Charge of the Mississippi V alley 



Laboratory, 



PERLEY SPAULDING, Special Agent. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued July 18, 190;: 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1903. 



