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ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Fig. 17. — White-marked tussock moth: caterpillar, or larva, on leaf. 

 This caterpillar is hairy; it has a red head, and its body is strikingly colored 

 with yellow, black, red, and white. 



on the empty cocoon. Newly hatched caterpillars skeletonize the 

 leaves and consume all but the large veins. 



Control Measure 1 or 2 (end of circular). Obviously, sprays 

 applied while the insect is in the cocoon and egg stages are in- 

 effective. 



Fall Webworm, fig. 6. — See under Ash. Control Measure 

 1 or 6 (end of circular). 



Elm Leaf Beetle, Galerucella luteola (Miiller), fig. 18. — An- 

 other ravenous leaf eater and a particular pest of Chinese elm, 

 the larva or grub of the elm leaf beetle skeletonizes the leaves, 

 causing them to dry out, curl, and drop prematurely. An ugly, 

 almost black, spiny grub hatches from each of the yellow, 

 spindle-shaped eggs placed by the female beetle in small groups 



