Nov. IS, 1919 Bacterial Blight of Soybean 193 



(7) Best growth of the organism occurs between 24° and 26° C. The 

 maximum is about 35°. The absolute minimum has not been deter- 

 mined. Slow growth develops at 2°. 



(8) The organism is sensitive to desiccation, and there seems to be 

 gradual loss in pathogenicity when it is grown in artificial culture. 



(9) Certain variations in cultural behavior exist between different 

 strains of the soybean blight organism, including the ability of some 

 strains — for example, the type — and inability of others to brown the 

 peptone media. Studies to date have led us to consider, at least for the 

 present, that we have been dealing with forms of a slightly variable 

 species. 



(10) Invasion occurs in the parenchyma. 



(11) Control measures are not yet fully worked out. At present 

 there seems to be greatest promise in the development of disease-resistant 

 varieties. 



