562 MAN CONTROLS HIS ENVIRONMENT FOR WEALTH 



insects, give us products used in tanning, and in making pyrogallic 

 acid which is much used in developing photographs. 



Economic loss from insects. While birds do hold insects in 

 check, the money value of crops, forest trees, stored foods, and 

 other materials destroyed annually by insects is beyond belief. 

 It is estimated that they destroy yearly one tenth of the country's 

 crops, which at the lowest estimate is about $1,000,000,000. 



Insects which damage garden and other crops. Grasshoppers 

 and the larvae of various moths do considerable harm here, 



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The corn worm does much damage to corn. How does it do this ? 



especially the " cabbage worm," the cutworm, which eats all kinds 

 of garden truck, and the European corn borer which destroys our 

 corn. 



Among the beetles which are found in gardens is the potato 

 beetle which eats the leaves of the potato plant. This beetle 

 formerly lived upon a wild plant of the same family as the potato, 

 and began to infest potato fields when that crop was introduced 

 in Colorado, evidently preferring cultivated forms to wild forms 

 of this family. 



The one beetle doing by far the greatest harm in this country 

 is the cotton-boll weevil. Imported from Mexico, since 1892 it 

 has spread over nearly the entire cotton-growing area of the 





