200 



BACTERIAL DISEASES OF PLANTS 



another. There should be a long rotation on infected lands, 

 using non-susceptible species clovers (?), grasses, etc. 



In this connection it is very important to know whether 

 any of our common forage crops are susceptible and also whether 

 many of our American weeds are subject to this disease, and 

 might act as hold-over hosts. Honing found susceptible weeds 

 in Sumatra; Stanford and Wolf have found them in North 

 Carolina. Long ago I found it readily inoculable into Datura 

 stramonium (the jimson-weed). Has anyone found it naturally 



FIG. 142. Tyloses in vessels of a potato stem attacked by Bacterium solanace- 

 arum. At A' is a vessel occupied by the bacteria. 



on this plant? In this connection read Stanford and Wolf's 

 papers. The disease has been reported to me several times from 

 Florida as occurring on "new land." 



LITERATURE 



For literature, etc., consult Van Breda de Haan's Wilt of 

 Peanut; Brown Rot of Solanaceae; and Wilt Diseases of Tobacco 

 in "Bacteria in Relation to Plant Diseases," Vol. Ill, pp. 151- 

 153, 174-219, and 220-271, Carnegie Institution of Washington, 

 1914. Ibid., Vol. I, plates 4, 24,25, 26,27, and Fig. 10; and Vol. 

 II, Fig. 1. 



