DISEASES 



OF 



ECONOMIC PLANTS 



BY 



F. L. STEVENS, Ph.D. 



PROFESSOR OF PLANT PATHOLOGY IN THE UNIVERSITY 

 OK ILLINOIS 



AND 



J. G. HALL, M.A. 



FORMERLY ASSISTANT IN VEGETABLE PATHOLOGY IN THE 

 NORTH CAROLINA AGRICULTURAL EXPERIMENT STATION 



REVISED EDITION BY F. L. STEVENS 



Npw fork 

 THE MACMILLAN COMPANY 



1921 



All rights reserved 



