226 Weeds. 



As regards the distribution of blueweed, 

 it is probable that the wind is the chief 

 agency employed in efifecting its spread 

 from place to place. The seeds of blue- 

 weed cling long to the receptacles in which 

 they grow, but in winter or toward spring, 

 the wind shakes many of them out of their 

 receptacles and drives them for miles over 

 the encrusted snows. This fact no doubt 

 will generally account for the sudden 

 appearance of blueweed in new centers, 

 where previously it had not been known to 

 exist. Blueweed is also probably distrib- 

 uted to some extent by means of clover 

 seed, where careless methods of farming 

 allow it to mature its seeds while growing 

 in meadows. 



Modes of Eradication. 



The following are the modes of eradica- 

 tion that have been found most successful 

 in dealing with blueweed : 



I. In cultivated fields. Really good cul- 

 tivation will keep blueweed from getting 

 much of a footing in the cultivated portions 

 of the farm. When stray plants put in an 

 appearance in a field that is not desired to 

 be broken up that same season, the spud is 



