Eradication of Ragweed and Kinghead. 147 



helpful in destroying these weeds, for the 

 reason that the plants grow late, rather 

 than early, in the season. 



2. Growing cultivated crops. Grow cul- 

 tivated crops, taking special care that the 

 cultivation is carried on well through the 

 season. 



5. Using the mower. When fields are 

 newly sown to grass, the use of the mower 

 in the autumn will be found very effective. 

 The mowing should be done as close to the 

 surface of the ground as possible, for the 

 reason that the seeds of the ragweed are 

 often formed low down on the stem, and of 

 course it should be done before any of the 

 seeds ripen. Pastures and meadows may 

 be treated in the same way. 



4. Spraying. Ragweed or kinghead in 

 fields of small grain may be killed or mate- 

 rially checked by spraying with any of the 

 materials recommended in the following 

 chapter, if applied when the plants are 

 about six inches high. 



Observations, (i) When infested mead- 

 ows or pastures are to be broken up, the 

 work should be done, wherever practicable, 

 before any of the seeds of the weed have 

 had opportunity to ripen. (2) When the 



