INSECTS OF THE PEACH 273 



usually the larva? confine their work to the trunk or the roots 

 of the tree, a short distance below the surface of the soil, but 

 occasionally they are found 5 or 6 inches under the ground. 

 When the larvae are full grown they leave their burrows and 

 spin a cocoon, coming out as adult insects in three or four 

 weeks. 



Fig. 117. — Canker on the limb of the peach. 



The only sure method for the control of this insect is to dig 

 the larva? out of their burrows with a sharp knife or some 

 similar instrument. A wire can often be used to kill the 

 insects in their burrows. The burrows of the borers are 

 usually indicated by conspicuous masses of gum together 

 with the casting and chewings of the insect. After the 

 18 



