AGRICULTURAL EXPERIMENT STATION. 

 FIG. 24. 



173 



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

 shown at (e) fall grown. At d. is shown the chr3\salis ; at (i) the 

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

 larva at the colyx 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 fall 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 larvae occupy the same fruit. 

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

 feeding upon the material round it, finally escaping through the 

 side. The larva requires about four weeks to mature. The fruit 

 aflf^ected falls prematurely'. If the larva attains its growth before 

 the fruit falls it lets itself to the ground b}'- a silken thread or 

 crawls 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 a cocoon which they cover with small 

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

 chrysalis takes place in about three days. The moth emerges in 

 about two weeks, is capable of laying about fift}' eggs, which are 

 deposited from time to time for two weeks or more. 



