FOES AND FRIENDS OF THE PLANT 



193 



which they have been breeding, and march like an army over 

 the country, destroying everything green which comes in 



their way. They are then known i 



as army worms. 



They may be stopped by a 

 deep furrow plowed with a 

 straight up-and-down edge to- 

 ward the field which is to *be 

 protected. Very few will be 

 able to crawl up this, and even 

 these may be stopped by fine 

 earth heaped up in a steep slope 

 above the furrow. The worms 

 crawl along the furrow, and if 

 post holes are dug a short dis- 

 tance apart they will fall into 

 them, and may there be killed 

 and buried. 



If they get into a vineyard, 

 heavy spraying is necessary to 

 keep them in check. (California 

 Experiment Station, Bulletin 

 192; Oregon, 38; New Mexico, 

 68; Washington, 47.) 



Corn worm. This is the worm 

 which does so much damage to 

 cotton in the Southern states, 

 where it is known as the cotton 

 boll worm. With us it attacks 

 corn and tomatoes. The moth 

 lays her eggs on the leaves, 

 where they soon hatch. The 

 young worms look somewhat 

 o 



FIG. 109. Army or cut worm. 

 (Enlarged.) 



