WEEDS' AND THEIR CONTROL 



10. Mowing weeds on roads around fences and in 



waste places before seeds develop on them. 

 176. How to Kill Perennial Weeds. Some of our 

 perennial weeds are the most difficult of all to control, 



while some are 

 quite easily 

 eradicated. The 

 tap or fibrous 

 rooted perenni- 

 als can be killed 



and careful cov- 

 ering of all vege- 

 tation, followed 

 by surface culti- 

 v a t i o n. The 

 creeping - rooted 

 ones are not so 

 easily dealt 

 with. One plow- 

 ing is seldom 

 sufficient to kill 

 them and fre- 

 quently several 

 plowings do not 

 succeed in doing 

 so. Three of the 

 common meth- 

 ods employed in controlling the creeping-rooted peren- 

 nials are as follow : 



1. Shallow plowing in the fall and deep plowing the 

 next .summer after the weeds have made a fresh 

 start. The first plowing followed by the cold win- 



bLUE. URR 



Fig. 78. Blue Burr. 



A typical tap-rooted winter annual or biennit 



