WEEDS AND THEIR CONTROL 



505 



5. When does the flower appear? This point is important 

 because if the flower is discovered before the seeds are formed 

 the plant may be eradicated by spraying, mowing or cultivation. 



Fig. 239. — Slender wheat grass, showing root system and single spike 

 (X 3); plant (X i). 



6. When does the seed ripen! If the seed ripens and falls 

 there is little chance of destroying the weed unless it is plowed 

 under, eight to ten inches, in the fall. This method of control is 

 not always satisfactory. It is advisable to burn the plant and 

 seeds. 



