APPLE INSECTS — BUDS AND FOLIAGE 



109 



Fig. 117. 



Fall webworm, nest. 



in diamder and 

 contains 300 or 400 

 ('ggs. The egg is 

 globular, 5V ii^^'^^ i^^ 

 diameter, and has 

 a deli(*at(^ thimble- 

 like sculpture. The 

 eggs of the first 

 brood hatch in 

 about 10 days and 

 those of the second 

 in jd)()ut a week 

 after deposition. 



Soon after hatch- 

 ing the extremely 

 hairy young cater- 

 pillars begin feeding 

 on the leaves, usually at the end of a branch, which they 

 inclose in a silken web. At first they feed only under cover 

 of the web, which is enlarged to inclose more foliage as 



there is need of fresh food. When 

 the caterpillars become larger they 

 leave the nest at night and feed in 

 the open. As food becomes scarce 

 on a branch, all or part of a colony 

 may migrate to another branch, 

 where a new nest is formed, or in 

 case the whole tree has been de- 

 foliated, they may crawl to another 

 tree. 



The full-grown caterpillars (Fig. 



119) are about li inches in length 



with a broad dusky stripe along the back and usually with 



yellowish sides thickly spotted with small blackish dots. A 



118. — The fall webworm, 

 moth laying eggs. 



