Minnesota Plant Diseases. 315 



spots which are usually elongated to narrow lines. Later they 

 increase to large irregular spots and may then entirely destroy 

 the leaves. Both the .sheaths and blades of the leaves are af- 

 fected. The roots are also attacked and it is possible that the 

 bacterium lives over unfavorable seasons in the soil. The bac- 

 terium is usually not found in the stems except in the wounded 

 portions. It is probably found in Minnesota though not yet 

 reported. 



Land upon which diseased plants have been grown should 

 not be sown to sorghum for a year or two. All diseased plants 

 should be burned. 



