56 



BACTERIAL DISEASES OF PLANTS 



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

 black chaff organism, Bacterium iranslucensv&r . 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. 



