INSECTS IN RELATION TO HUMAN WEALTH 565 



(Fig. 231). This animal is sensitive to extremes of temperature 

 and has many natural enemies. Planting early-ripening va- 

 rieties in wide rows, and then burning the stalks and rubbish 

 after the harvest, will do much to keep the pest under control. 



The gypsy moth (Figs. 236 and 237) has been a pest for 

 nearly tw^o hundred years and was brought to this country after 



Fig. 233. The flour moth (Ephestia kiielmiella) 

 a, larva; b, pupa; c, adult. (X 2) 



Fig. 234. The buffalo moth 



This insect {Anthrenus scrophulariae) is a beetle, but is commonly called a moth 



because it injures furs and rugs in a manner resembling that of the clothes moth. 



a, larva; b, pupa in larval skin; c, pupa; d, adult. (Greatly enlarged) 



the Civil War. The larvae feed upon the foliage of many kinds 

 of forest and orchard trees, ruining the plants completely. 



The codling moth is familiar to everyone who has found a 

 wormy apple. This insect is present wherever apple trees are 

 grown, and in some regions it destroys from 40 to 75 per cent 

 of the crop (see Fig. 238). 



The Hessian fly is supposed to have come to this country with 

 the Hessian soldiers during the Revolutionary W^ar. It has 

 spread to all parts of the world, probably attached in the pupal 



