6 Farmers’ Bulletin 1246. 
periods in the winter. Larve varying from quite small to nearly 
full grown are to be found in the trees during summer; during late 
Fic. 3.—Gum and frass exuding from base of peach 
tree, the usual sign of infestation. 
spring, however, they are more 
nearly of full size. The ma- 
ture peach borer (fig. 5) is 
about an inch long, yellowish- 
white, with dark reddish head. 
On the body are a few brown- 
ish hairs arising from tubercles. 
THE PUPA. 
The peach borer, when full 
grown and ready to change its 
form, incloses itself in a cocoon 
composed of silk, in which are 
incorporated particles of bark 
and excrement, forming a tough, 
brownish, capsule-like structure. 
The cocoon (fig. 6) is usually 
constructed at the head of or 
somewhat beyond the larval 
burrow, and, owing to its simi- 
larity in color to that of the 
bark of the tree, it is often over- 
looked by orchardists. Borers 
infesting the roots some inches 
from the base of the tree may 
work directly upward to the 
surface of the soil and there 
‘construct their cocoons. Shel- 
tered within the cocoon the 
larva changes to a pupa, or 
chrysalis. The pupa (fig. 7) is 
about three-fourths of an inch 
in length, brown, and provided 
with stiff spines on the back 
to assist it in working itself out 
of the cocoon, thus facilitating 
the escape of the moth. Within 
three or four weeks the pupa is 
fully developed and wriggles 
out of the cocoon, the emerging moth leaving the empty skin protrud- 
ing more than halfway from the cocoon (fig. 6). 
