56 



BACTERIAL DISEASES OF PLANTS 



FIG. 38. Kernels of Russian winter wheat attacked and shriveled by the 

 black chaff organism, Bacterium iranslucensvar. undulosum, S., J. R., Coll. No. 271 A, 

 Kansas, 1917. All kernels from one head and all but 8 shriveled. Bacterial films 

 can be seen on the shriveled kernels, especially those of the middle row. 



