CONTENTS 



PAGE 



Methods 6 



Inoculation experiments 6 



Pure-culture studies 7 



The bacterial blight of the bean caused by Phytomonas phaseoli 8 



Life history 9 



Symptoms 12 



General 12 



On the leaf 12 



On the stem 14 



On the pods 14 



On the seeds 15 



Inoculation experiments 15 



On the bean 15 



Cross inoculations 16 



Etiology 18 



Morphology 18 



Cultural characteristics 18 



Brief description 21 



A disease of the bean caused by a variety of Phytomonas phaseoli (var. fuscans) 22 



Inoculation experiments 22 



On the bean 22 



Cross inoculations 24 



Etiology 24 



Morphology 24 



Cultural characteristics 25 



Nomenclature 28 



Brief description 29 



The bacterial wilt of the bean caused by Phytomonas flaccumfaciens 29 



Life history 29 



Symptoms 31 



General 31 



On the leaf 31 



On the stem 31 



On the pods 31 



On the seeds 33 



Inoculation experiments 33 



Etiology 33 



Morphology 34 



Cultural characteristics 34 



Brief description 37 



Halo blight caused by Phytomonas medicaginis var. phaseolicola 37 



Life history 38 



Symptoms 39 



Stunting and wilt 39 



On the leaf 40 



On the stem 44 



On the pods 44 



On the seeds 45 



Inoculation experiments 47 



Etiology 47 



Morphology 47 



Cultural characteristics 48 



Brief description 50 



3 



