Diseases of Economic Plants 



Bv F. L. STEVENS, Ph.D. 



Professor of Plant P.-itliology , University of Illinois 



AND 



J. G. HALL, M.A. 



Formerly Professor of Plant Pathology, Washington State College 



Cloth, illustrated, l2mo, ^3^ pp., $2.00 



Students of Plant Diseases are naturally divided into two categories. 

 First : Those who wish to recognize and treat diseases, without the bur- 

 den of long study as to their causes ; Second : Those who desire to 

 study the etiology of diseases, and to become familiar with the parasites 

 which are often their cause. The present book is designed to meet the 

 needs of the first of these two classes of readers, and particularly for 

 such students in the Agricultural Colleges and Agricultural High 

 School.!. It indicates the chief characteristics of the most destructive 

 plant diseases of the United States caused by cryptogamic parasites, 

 fungi, bacteria, and slime moulds, in such a way that reliable diagnoses 

 may be made, and fully discusses the best methods of prevention or cure 

 for these diseases. In this volume only such characters are used as 

 appear to the naked eye or through the aid of a hand lens, and all tech- 

 nical discussion is avoided in so far as is possible. No consideration 

 is given to the causal organism, except as it is conspicuous enough to 

 be of service in diagnosis, or exhibits peculiarities, knowledge of which 

 may be of use in prophylaxis. While, in the main, non-parasitic dis- 

 eases are not discussed, a few of the most conspicuous of this class are 

 briefly mentioned, as are also diseases caused by the most common 

 parasitic flowering plants. A brief statement regarding the nature of 

 bacteria and fungi and the most fundamental facts of Plant Physiology 

 are given in the appendix. . Nearly two hundred excellent illustrations 

 greatly increase the practical value of the book. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



