114 PLUM, PEACH, AND CHERRY INSECTS 



trunk may be largely prevented by wrapping the trunk with 

 building paper. This paper should extend an inch or two below 

 the surface of the ground. These wrappings should be applied 

 before the moths emerge and should be removed after egg-laying 

 is over. One can also resort to digging the borers out in the fall 

 and again in the spring. This is a good plan for the South. 



A B 



FIG. 136. Peach-tree borer (S. exitiosa): A, male; B, female. 



The Plum-tree Borer (Sesia pictipes G. and R.). This borer 

 is quite a common pest, injuring the inner bark and sap wood of 

 the trunk and limbs of plum and similar trees. It works somewhat 

 after the manner of the preceding species. It is found in both the 

 cultivated and wild plum and also in wild cherries. It turns into 



a clear-winged moth, the two sexes 

 resembling closely the male of the 

 peach-tree borer in fact, is hardly 

 to be distinguished from that species. 

 Control. Cut out and burn in- 

 fested parts of the tree. 



The Fruit-tree Bark Beetle (Scoly- 

 tus rugulosus Ratz). If it were not 

 Ct & for various enemies this insect would 



FIG. is?. Fruit-tree bark beetle; dorsal be verv injurious. The adult appears 



view and in profile. (U. S. Bu. Ent.) , . T , j 



in early spring. Its presence is de- 

 tected from the fact that the outer bark is penetrated by numerous 

 small " worm-holes" or " shot-holes." From these holes the gum 

 exudes, especially in the case of stone fruits. Weak or diseased trees 

 are most subject to attack, but young, healthy trees may also suffer. 

 Life History. From the worm-holes the beetles emerge in 

 April and May (Fig. 137). The female burrows through the bark 

 to the sap wood, where she eats out a vertical brood-chamber. 



