AGRICULTURAL EXPERIMENT STATION. 



137 



FIG. 24. 



expanded and the same with closed wings at (f). The larva is 

 shown at (e) fall grown. At d. is shown the chrysalis ; at (i) the 

 cocoon, at (h) the head of the larva enlarged. The entrance of 

 the larva at the calyx of the apple is shown at (b). The dark 

 shaded portions of the figure represent the borings of the larva and 

 the hole at the side the place where the full grown larva escaped. 



LIFE HISTORY. 



First Brood. — The eggs are laid singly in the eye of the apple 

 when about the size of a pea, or occasionally' at the stem end or even 

 on the cheek. Sometimes two or more larvge occup}' the same fruit. 

 The eggs hatch in about a week and the larvie bore toward the core, 

 feeding upon the material round it, finally escaping through the 

 side. The larva? require about four weeks to mature. The fruit 

 affected falls prematureh'. If the larvi\3 attain their growth before 

 the fruit falls, they let themselves to the ground by a silken thread 

 or crawl down the branches to the trunk. Those that let themselves 

 down or fall with the fruit generally crawl along the ground to the 

 trunk, where they with the others conceal themselves in the crevices 

 or cracks of the bark, spin cocoons which they cover with small 

 pieces of bark or other available material. The change to the 

 chrysalis takes place in about three days. The moths emerge in 

 about two weeks, are capable of laying about fifty eggs, which are 

 deposited from time to time for two weeks or more. 



