Eradication of Corn Cockle. 217 



Modes of Eradication. 



1, Sozu clean seed. The best method of 

 preventing the growth of corn cockle in 

 grain fields is to sow clean seed. When the 

 weed is once introduced it is rather difificult 

 to eliminate from wheat fields where the 

 crop is grown continuously. Screening 

 will remove some of the seeds from seed 

 grain, but as they are nearly as large as a 

 grain of wheat, they are difficult to elim- 

 inate. 



2. Proper rotation. As corn cockle is an 

 annual weed which soon gives way to thor- 

 ough cultivation, a system of rotation which 

 introduces a cultivated crop every two or 

 three years will, if proper care is used in 

 sowing clean seed grain, soon eliminate it. 



J. Hand pulling or spudding the plants 

 which occur in wheat fields, if they are not 

 too numerous, is the surest way to check 

 the spread of this weed. The conspicuous 

 flowers make the plants easy to locate in 

 the field, and as they are readily removed, 

 this method is not as slow or difficult as 

 might at first appear. 



4. Harrozving small grain in the spring 

 when it first appears above the ground, and 



