PLATE 4 



j^ 2. — Spikes' magnified to show more distinctly the dark blotches and stripes 

 which are signs of the disease. Kansas, 1913. Bacteria present. 



3. — Outer surface of a leaf sheath showing black spots and stripes occupied by bac- 

 teria. No. 153. Farmington, Ark., 1917. 



(54) 



