INSECTS INJURIOUS TO AGRICULTURE. 215 



The Peach-tree Borer (Sannina exitiosa Say). This 

 borer outranks all other insects as a destroyer of peach- 

 trees. It lays its eggs in the bark near the ground, and 

 the worm on hatching attacks the living trees, boring into 

 the bark and sap-wood of the roots, or trunk, causing the 



a 



FIG. 260. Peach-tree borer, a, male; b, female. 



gum to exude, so that its presence may be easily noticed. 

 When the caterpillar is one year old it makes a cocoon 

 under the bark of the trunk or at the larger roots of the 

 tree. To prevent its attacks heap the earth high around 

 the trunk, or wrap tarred paper around the lower part of 



FIG 261 1 eggs'of the currant saw-fly deposited along the midribs; 2 and 3, 

 the holes bored by the young worms. 



the trunk; when the worm is fairly at work, cut it out, ap- 

 plying wax or clay to the wound. 



