6 CONTENTS. 



Page. 



Crown rust of oats '^^ 



Physiological relations ^^ 



Occurrence and ilistril)ntion ^^ 



Wintering of the uredo *9 



Liability of different varieties to this rust 49 



Damage ^ 



Black stem rust of wheat ^2 



Physiological relations ^3 



Occurrence and distribution 57 



Wintering of the uredo 57 



Liability of different varieties to this rust 58 



Damage "^ 



Black stem rust of rye ^^ 



Black stem rust of oats ^0 



Physiological relations oO 



Occurrence and distribution 64 



Wintering of the ui-edo o4 



Liability of different varieties to this rust 65 



Damage "5 



Maize rust 6o 



Physiological relations 65 



Occurrence and distribution 66 



Wintering of the uredo 67 



Liability of different varieties to this rust 67 



Damage 



General remarks 



Summary "^ 



70 

 Bibliography 



Explanation of plates '^ 



ILLUSTRATIONS. 



Fig. 1. Healthy and shriveled grains of Jones Winter Fife wheat 59 



Plate I. Comparative rustiuess of four varieties of wheat from orange leaf 



rust ' 



II. Yx and Theiss wheats rusted in 1897 74 



III. Cereal rusts from artificial infections 74 



IV. Cereal rusts from artificial infections 74 



