646 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



exudes from the crowns of trees injured by them. The injury 

 is done by the larvae feeding on the soft inner bark of the crown 

 of the root, the adjacent roots and the base of the trunk. Often 

 the larvae will completely girdle a tree and where a tree is infested 

 by several borers, the foliage turns yellow and if not treated will 

 soon die. Such a tree is much more susceptible to the attacks 

 of bark beetles and diseases. Probably as many peach trees 



FIG. 498. Peach borer moths (Sannirwidea exitiosa Say) natural size. 

 The upper one and the one at right are females, the other two males. 

 (After Slingerland.) 



are lost from the work of borers as from any other one pest, with 

 the possible exception of the San Jose scale. 



The adults are clear-winged moths which fly during the day 

 and might be readily mistaken for wasps. The females are a 

 deep steel-blue with a broad orange band across the abdomen. 

 The fore-wings are opaque, covered by the bluish scales, and 

 expand about 1| inches, while the hind-wings are transparent 

 except the dark margin. The males are smaller, with the wings 



