24 



BACTERIAL DISEASES OF PLANTS 



FIG. 16. Black chaff of wheat. A glume infection done by Lucia McCulloch 

 in the summer of 1917 with No. 20, from McKinney, Texas. Inoculated June 21 

 from a pure culture. Photographed July 9. The tiny beads are bacterial masses 

 oozing from stomata. X 13. 



