PKEFACE 



yii 



part) ; Scribner, figures 38, 42-44, 50-52, 61-63 ; Seymour, 45, 

 S6 ; E. F. Smith, plate VIII ; W. G. Smith, plate XVII ; Sorauer^ 

 figures 13, 14 ; Thaxter, figures 56, 67-69 ; Tulasne, figure 84 

 Waite, figure 15 ; Ward, figure 6. 



I have aimed to treat of only the more destructive and 

 wide-spread fungous diseases, especially those for which prac- 

 tical remedies are known ; and have endeavored to give such a 

 €oncise account of the more important facts concerning these 

 a-s will enable the cultivator to combat them intelligently. A 

 few of the paragraphs in the following pages have already been 

 printed in my series of articles on Plant Diseases in the National 

 Stockman and the American Agriculturist; and in a few other 

 instances I have drawn upon my previous writings. I desire 

 also to express my obligations to the directors and other offi- 

 cers of a number of experiment stations — notably those of 

 Connecticut, Cornell University, Delaware, Kentucky, Massa- 

 chusetts, New York, New Jersey, New Hampshire, Ohio, 

 Ehode Island, and Vermont — for the use of plates of illustrations. 



C. M. W. 



New Hampshire College of Agriculture and Mechanic Arts, 

 Durham, January, 1894. 



