238 



PESTS OF ORCHARD AND SMALL FRUITS 



dence of the work of the peach-tree borer. This may be observed at 

 any time of year, but the gum is fresh in late summer or very early 



Fig. 307. — The Peach-borer. Larva in burrow. Slightly enlarged. Original. 



in the spring. If one will take a sharp knife and cut through the bark, 

 one will find a burrow running in the sapwood, and at its end a yellowish 

 or pinkish grub, with brown head. The length of a full-grown grub 

 is about one inch. Peach trees are much weakened 

 by the attack, and if several borers are present, 

 the tree may be killed. Cherry and plum trees 

 are infested to some extent by the same borer. 



The adult is a moth, but its clear wings give it 

 much the appearance of a wasp. In the female 

 only the liind wings are clear. Its general color 

 is deep blue. The abdomen of the female is 

 marked by an orange band. 



Eggs are laid in May, June, or July, directly on 

 the bark, usually near the ground. The young 

 grub works entirely in the sapwood, from the time 

 when first hatched until the early part of the 

 following summer, resting and remaining dormant 

 during the winter months and resuming activity 

 in the spring. The moths emerge from May until July. There is 

 one generation each year. 



Fig. 308.— Cocoon 

 of the'Peach-borer. 

 Original. 



