178 



BACTERIAL DISEASES OF PLANTS 



451-458, 1915). Stanford and Wolf have found it attacking 

 several weeds in North Carolina (Eclipta alba, Ambrosia artemis- 

 iaefolia) and have successfully inoculated it into a variety of 

 plants including Impatiens balsamina. In 1918 fields of Rici- 

 nus communis (castor oil plant) were attacked by it and seriously 

 injured in Georgia and Florida (Smith and Godfrey, I. c.} In our 



FIG. 120. Early Rose potato inoculated by needle-pricks on the stem with a 

 culture of Bacterium solanacearum. Time, 37 days. Wilt developed slowly, 1905. 



hothouse tests we found it able to attack Vanilla planifolia, Heli- 

 anthus annuus and young cotton plants. In 1919 it was found 

 in Florida on beans (Smith and McCulloch, I. c.) and was suc- 

 cessfully inoculated into beans and peas. 



On tomatoes the leaves are bent downward (Fig. 121, left) 

 and the stems develop numerous incipient roots (Fig. 122, left). 

 To a lesser extent these roots appear on tobacco'stems. They 



