THE BROWN ROT OF SOLANACEAE I CAUSE 



183 



FIG. 126. A. Bacterium solanacearum on red-flowered Impatiens balsamina. 

 Left-hand shoot inoculated July 2, 1918. An internal brown stain extended down 

 the stem a foot or more beyond the needle pricks which were at X. Height of 

 plant 24 inches (to top of curve of wilted stem). Lower side-shoots still healthy. 

 Photographed July 30, 1918, Y natural size. 



B. Stem of garden balsam from same series as .4, but enlarged to show vascular 

 black stripe visible through the unbroken translucent cortex. Plant inoculated 

 20 davs and about 4 inches above part here shown. X 4. 



