CHAPTER IX. 



SPECIFIC MODES OF ERADICATING MISCEL- 

 LANEOUS TROUBLESOME WEEDS. 



The most important of the weeds which 

 give trouble to the farmer in the northern 

 United States which have not been treated 

 in the three preceding chapters are the Rus- 

 sian thistle, the plantains, biiidzveed, wild 

 buckzvheat, corn cockle, wheat-thief, blue- 

 weed and wild carrot. Tlie last three of 

 these are most serious in eastern Canada 

 and the eastern United States. Wheat- 

 tliief and the blueweed belong to the same 

 botanical family, as do the Russian thistle 

 and the wild buckwheat. With these excep- 

 tions, the weeds mentioned in this chapter 

 are not closely related. 



(l) THE RUSSIAN THISTLE. 



The Russian tliistle (Salsoli kali var. 

 tragus) is one of tiie most aggressive weed 

 pests that has ever come to the prairies of 

 the west. It is frequently called the Rus- 



