PLATE 3 
A. —Bacterial spot on pod of lima bean. Natural infection, showing dark-colored 
lesion extending along the dorsal suture. X 2%. 
B. —A portion of lima bean pod affected with bacterial spot. Natural infection, 
showing drops of exudate which came out over night in a moist chamber at room 
temperature. X 5. 
C. —Photomicrograph of Bacterium viridifaciens from a 24-hour old nutrient agar 
culture, and stained with the Duckwall modification of the Pitfield method to show 
flagella. Note that two cells are undergoing the process of division. X 850. 
