1 6 Weeds. 



grow so thickly that it will require all the 

 room that can be given it to enable it to 

 perfect its growth, it follows that the injury 

 through crowding from weeds will be in 

 proportion to the number and vigor of the 

 weeds. Weeds also grow more quickly 

 than useful plants, hence by their shade 

 they hinder that perfect development of the 

 useful plants which abundant sunlight is 

 necessary to secure. 



J. Weeds harbor injurious inseets and 

 plant diseases. Weedy fence rows, waste 

 places, and stubble furnish winter lodgment 

 to'the chinch bug and various other injuri- 

 ous insects. Certain weeds, by their dense 

 growth, form an excellent harbor for plant 

 lice. The dense shade formed by a rank 

 growth of weeds furnishes conditions favor- 

 able to the development of rust, mildew, 

 and other plant diseases. Some of the dis- 

 eases of the cabbage, cauliflower, and turnip 

 also occur on the wild mustard and similar 

 plants, and are spread by them. 



4. Weeds add much to the labor of clean- 

 ing grain for market and for seed. Were 

 it not for the presence of weed seeds, it 

 would not be necessary to spend much time 

 in cleaning grain intended for sale. It is 



