CONTENTS 



PAGE 



The host 101 



The disease , , 104 



Economic aspects 104 



Name, history, and geographical distribution 104 



Economic importance 106 



Symptomatic aspects 107 



On the seed 107 



On the seedlings 108 



On the leaves 108 



On the roots and other parts 108 



On the pods 110 



Etiologic aspects 112 



Name, classification, and synonymy of the causal organism 112 



Morphology and physiology 116 



Spores 116 



Spore germination 117 



Mycelium and spore production in culture 120 



The ascogenous stage 124 



Relation of fungus to host 126 



Penetration of the host 126 



Reproduction of the fungus within the host 128 



The fungus in the seed 129 



Infection of the seedling from affected seed 131 



Longevity of fungus in soil 132 



Further infection of the plant and spread of the disease through 



the field 144 



Infection of seeds 146 



Infection studies 147 



Susceptibility of plants of different ages to infection 147 



Susceptibility of different parts of the plant to infection 148 



Susceptibility of different varieties of Phaseolus vulgaris L. to 



infection 148 



Susceptibility of other species of the genus Phaseolus to infection 152 

 Susceptibility of plants of other genera and families to infection . 153 

 Susceptibility of Phaseolus vulgaris to infection from other 



anthracnose fungi 157 



Ecologic aspects 159 



Prophylactic aspects 164 



Seed disinfection 164 



Sorting out affected seed 168 



97 



