INSECTS INFESTING THE PEAR TREE. 



121 



The young caterpillar (Fig. 98) commences to feed by eating 

 a short track, apparently under the surface of the leaf; it 

 eventually makes an opening in which it feeds until one fourth 

 grown, or six days old ; it then leaves this opening and com- 

 mences feeding on the edge of the leaf, and as there are often 

 from one to eight on a leaf, they move from one leaf to 

 another until full grown, which is in about twenty-two days 

 from the time they were hatched. When the larva, or cater- 

 piller, ceases to eat, it descends to the earth and crawls below 

 the surface and makes a tough, dark-brown oval cocoon. In 

 this cocoon it hibernates, in the larval state, until the next 

 Spring. Caterpillar (larva) ; length, six lines ; color, green ; 

 head, yellowish-green ; eyes, black ; twenty legs. 



Fig. 98. 



Fig. 98. — Pear leaf, caterpillar and work. 

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