CONTENTS 



PAGE 



Host range 3 



Relative susceptibility ol grasses and of cereals 4 



Grasses 4 



Cereals 11 



Varietal susceptibility in wheats 12 



The disease 14 



Names 14 



History and range 14 



Economic importance 16 



Symptomatology 18 



Symptoms 18 



On roots 18 



On culms and heads 19 



Signs 19 



Comparative symptomatology 20 



Etiology 20 



Nomenclature 20 



Pathogenicity 20 



Life history 24 



Pathogenesis 24 



Inoculation 24 



Incubation 27 



Infection 29 



Saprogenesis 30 



Ecology 30 



Moisture and temperature . . 30 



Soil fertility and acidity 33 



Date of planting , 36 



Rate of seeding 38 



Control 38 



Exclusion 38 



Eradication 39 



Protection 40 



Immunization 41 



Bibliography 42 



