PLANT BACTERIA, VOL. 3. 



PLATE 30. 



Potato plant which yielded Bacterium solanacearum (District of Columbia strain). 



Stems externally sound but flabby at the tips; leaves wilted or shriveling; vascular system browned and occupied by the bacterial 

 slime. No superficial ulcers. From a potato field at Woodridge. D. C, July 8, 1904. 



