190 



BACTERIAL DISEASES OF PLANTS 



Fig. 132.— .Surface and buried colcjnies 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 X is a white concentric striate intruding colon>-. 

 X 10. 



