174 Weeds. 



While tumbling mustard infests all kinds 

 of crops, it is peculiarly troublesome in 

 cereals. Where these get an early and 

 vigorous start in the spring, they will keep 

 the' weeds in check for that reason, but 

 when from any cause the crops are weakly, 

 the weeds will soon overshadow them. It 

 does not give serious trouble in pastures or 

 meadows. This plant will grow in various 

 classes of soils, but it thrives most vigor- 

 ously on those essentially humous in their 

 composition. 



Tumbling mustard is propagated chiefly 

 by such agencies as wind, water, birds and 

 the seeds of cereals and millet, but of these 

 the first mentioned is by far the most potent 

 and dangerous. As the wind is such an 

 efifective agency in its distribution, anything 

 that will stop the spread of this weed by 

 this means, as a wire fence, will be useful. 

 If the mustard and other plants which col- 

 lect along the fence are then gathered up 

 and destroyed, they will be prevented from 

 again blowing out into the fields when the 

 direction of the wind changes. 



