10 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



a web, which they enlarge to take in fresh foliage as needed. 

 They do not consume the leaves entirely but skeletonize them to 

 such an extent that they curl, dry up, and eventually die. 



Fig. 6. — Fall webworm : tent and damage. The tent or webbing contains 

 a colony of pale green, or yellow, hairy caterpillars that feed on foliage of 

 the host tree. 



