190 



BACTERIAL DISEASES OF PLANTS 



FIG. 132. Surface and buried colonies of Bacterium solanacearum (Ricinus 

 wilt.) plated a second time from inoculated tomato. Agar plate poured July 6, 

 1918. Photographed July 10, with oblique light. Shows characteristic irregu- 

 larity of surface colonies. At A' is a white concentric striate intruding colony. 

 X 10. 



