PLANT BACTERIA, VOL. 3. 



PLATE 9. 



Longitudinal sections through stems of 10 sweet-corn plants, showing invasion by Bacterium steivarti. 



Plants inoculated when young by placing bacteria from a pure culture in the drops of fluid extruded from the leaves and resting on 

 their tips. Signs of disease in about 2.5 months, when the plants were 3 to 4 feet high. Bacteria confined principally to the 

 vascular bundles. Nodes brown, internodes white, except infested bundles, which were usually bright yellow, but occasionally 

 brown. In X, X, bacteria have escaped into the parenchyma, forming bright yellow pockets. In c, the brown stain involves 

 the whole of the lower internodes. About natural size. 



