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INSECT ENEMIES OF EASTERN FORESTS 493 
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Figure 116.—Oak leaves with the blotch mines of Cameraria hamadryadella. 
the upper and lower epidermis for about 3 weeks after hatching, then 
vacate the mines and curl the leaves by spinning several strands of 
silk. They continue their feeding by skeletonizing from the upper 
surface in the curled leaves. ‘The injured parts of the leaves dry up and 
give the bush a very unsightly appearance. Pupation takes place in the 
