336 



WEED FLORA OP IOWA 



as necessary to kill weeds and put in wheat when the time comes. 

 The next season as soon as the wheat is harvested remove from the 

 field and go on with the mower. This will clip all or most all of 

 the young cocklebur plants, as well as other weeds, and following 

 this operation the stubble should be plowed as rapidly as possible 

 and prepared for another crop of wheat. Another season's treat- 

 ment of this sort will generally reduce the burs to such an extent 

 that very few will be left and these can be pulled by hand. 



Fig. 195. Spiny Clotbur (Xanthium spinosum). "Waste places from Maine to 



Kansas. Perhaps in southern Iowa. 



(Photographed by Colburn. ) 



"One of our Nebraska subscribers, Mr. J. J. Bishop, stated some 

 time ago that he succeeded in almost clearing out a badly infested 

 field of cockleburs in two years by employing the following 

 method : Just as soon as the removal of the oat crop the soil was 

 plowed and prepared for winter wheat, this crop being sown at 



