BACTERIAL CANKER OF TOMATO: TYPE 



205 



in the field. I have had it from Michigan, Western New York 

 and Eastern Massachusetts. So far it has not been reported 

 from the Southern States, but I beheve I had it once from 

 Texas without recognizing it as distinct from the brown rot. 

 It undoubtedly occurs in Europe. It should be looked for in 

 England, France, Belgium, Germany and Italy. 



Fig. 145. — -Stems of tomato plants inoculated with Aplanobacter michiganense 

 October 5, 1909, and photographed January 17, 1910, when most of the foliage 

 had shriveled. These show slight tendency to formation of adventitious roots, 

 as compared with those attacked by Bacterium solanacearum. Compare with 

 Fig. 122 inoculated only 12 days. 



Cause. — This disease is due to Aplanobacter michiganense 

 EFS. This is a rather short, viscid, yellow, non-motile, non- 

 sporiferous, non-gas-forming, aerobic, very slowly liquefying, 

 non-nitrate-reducing, rod-shaped schizomycete (Fig. 159) form- 

 ing slowly on beef-peptone agar-poured plates small circular 



