286 



BACTERIAL DISEASES OF PLANTS 



FIG. 219. Bean blight due to Bacterium phaseoli: Pod sprayed December 14, 

 1914, with a pure-culture suspension in water. Plants exposed 19 hours in the 

 inoculation cage. This was one of the largest spots on a half-grown pod, most 

 were decidedly smaller. Its regularity indicates a single central stomatal in- 

 fection. There is a drop of yellowish bacterial ooze in the center of the spot. 

 Variety, Extra Early Refugee. Planar enlargement by James F. Brewer. Photo- 

 graphed December 26, 1914. X 6 circa. 



