[Vol. 9 



336 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



the present I may merely refer to my descriptions of a bacterial 

 disease of field corn (I, '19 a , '21) and to note, as will be fully 

 discussed in another publication, that Burrill's organism is either 

 not identifiable or is not related to disease production. The 

 pathogen is quite unlike the foxtail organism. 



In 1893 Cobb described a bacterial disease of sugar cane. The 

 disease is so thoroughly described by Smith ( I, '14, pp. 3-71) 

 that there is no necessity for discussion of it here. We may 

 note, however, that Pscudomonas vascularum, a yellow rod, is 

 typically a vascular disease producer. These characters alone 

 are sufficient to distinguish it from the foxtail organism. 



A bacterial disease of sweet corn was first described by Stewart 



(I, '97) ; this, like the sugar cane disease, is also a vascular 



parasite, is yellow in color, and according to recent investigations 



(McCulloch I, '18), is non-motile. All these features, as well 



as others, indicate that it is quite distinct from the foxtail patho- 

 gen. 



Another non-motile, yellow parasite is Aplanobacter Rathayi. 

 It was first described by Rathay in 1899 as attacking orchard 

 grass near Vienna. According to Smith (I, '14, p. 155), who gives 

 a good account of this disease, it is also present in Denmark. 

 Descriptions indicate that this also is distinct from the motile, 

 white, foxtail organism. 



In 1901 Guffroy described knots on rhizomes of Arrhenatherum 

 elatius which he decided were brought about by bacteria; he 

 named the organism Bacterium moniliformans. The original 

 article has not been seen by the writer, but according to Sorauer 

 (I, '08, p. 30) Guffroy has presented no proof for his conclusions. 



Voglino (I, '05, pp. 43-44) described a bacterial disease of 

 rice, present in Italy. The large size of the organism, 2.5-3.5 X 

 3.8-4.0 u, should readily distinguish it from all other organisms 

 attacking grasses. 



Manns (I, '09) published an extensive account of a bacterial 

 disease of oats, although Galloway and Southworth as early as 

 1890 and Russell in 1892 briefly described a bacterial disease of 

 the same host. It may be noted that Manns' conclusions con- 

 cerning the cause of the disease have been questioned, and more 

 recently Miss Elliott (I, '20) has given a detailed account of a 

 halo-blight of oats. Concerning the disease which Manns de- 

 scribed, she says (p. 167); "His colored figures as well as most 

 of his text indicate an entirely different disease, but his Plate 



