24 



BACTERIAL DISEASES OF PLANTS 



Pio. 16.— Black (-ludf of wheat. A sluuie mlcction 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. 



