Bui. 887, U. S. Dept. of Agriculture 
^1 I 
Plate 
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Pear Borer and Nature of Injury to Trees. 
A, Young apple tree showing characteristic injury at base of larger branches. B, Larva in 
burrow in apple bark; enlarged. C, Same as A, showing injury more in detail. D, Borer 
working in excrescence on apple branch; natural size. 
