DESCRIPTIVE MANUAL 



371 



■Figure 217A 



Figure 217B 



Fig. 217-A. Trichome or plant hair from leaf of Burdock. 

 (Drawing by Charlotte M. King.) 



Fig. 217-B. Distribution of Burdock. 



Extermination. — Burdock is easily destroyed. Since it is a 

 biennial, cut off below the crown during spring or summer. If it 

 comes up again, cut off once more, or as often as may be necessary. 



Dr. Vasey says: "It may also be killed by being mowed when 

 the seed has fully formed, and the tops burned." 



Prof. Shaw says: "Farmers who go over their fields twice a 

 year with the spade will soon have no burdock." 



Prof. Goff says: "During the first year of growth the plant is 

 readily destroyed by pulling out by the roots when the ground is 

 very wet." 



The important thing is not to allow it to go to seed ; it will then 

 die if left to itself. But we may always expect an abundance of 

 the weed as long as it is allowed to grow in waste places. Then 

 add to this its excellent means of dispersal and no wonder it is con- 

 stantly coming up in out-of-the-way places. 



