486 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



covered with whitish down from the body of the female, and 

 hatch in about ten days. The young larvae are pale yellowish 

 with brown markings and appear to be almost all head and hair. 

 They at once spin a web over the foliage on which they are feed- 

 ing, those from one egg mass feeding together and enlarging the 





FIG. 410. The fall webworm (Hyphantria cunea Dru.): a, light form of 

 full-grown larva; b, dark form of same; c, pupa; d, spotted form of 

 moth all slightly enlarged. (After Howard, U. S. Dept. Agr.) 



web as necessary. In the North the webs are usually noticed in 

 early August and are started at the tips of the limbs. Within them 

 the surfaces of the leaves are eaten off until they are left dry and 

 brown. When all the foliage on a limb has been consumed, the 

 caterpillars leave the web, enclosing the dead leaves, and form a 

 new web" on a fresh branch, and thus the tree soon becomes covered 



