MONTANA P:vPERIMENT STATION. 



161 



tender leaf-shoots. \\hen one leaf shoot has dried so as to become 

 unsuitable for food another is attacked. The larva becomes full 

 grown in about two weeks and jnipates in a rather unsubstantial 

 cocoon among \vithered leaves or on the surface of the bark. The 

 moth issues in May and is very small and grayish. Two later 

 broods occur, the lar\ae boring into the twigs as described or into 

 the fruit. 'i'he lar\ae of this second brood construct the burrows 

 in the bark in which to hibernate. 



Fig. 10: The Peach Twig-borer: a. twig of peach, showing in crotch minute 

 masses of chewed baiiv al)cve laival chambers; b. latter much enlarged; c, 

 a larval cell, with contained larva, much enlarged; d, dorsal view of young 

 larva, more enlarged. (Marlatt, Farmer's Bulletin 80, U. S. Dept. of Agr., 

 1S98.) 



Fig. 11: The Peach Twig-borer: a, moth with spread wings; b and c, same 

 with wings closed, illustrating position normally assumed — all much enlarged. 

 « Marlatt. Farmer's Bulletin SO, U. S. Dept. of Agr., 1898.) 



