INSECTS INJURIOUS TO ORCHARD FRUITS 



507 



pit in stone fruits. The larva becomes grown in from twelve to 

 eighteen days (in peaches) according to Quaintance, but in cen- 



FIG. 434. Plum curculio on young 

 apple and egg punctures en- 

 larged. 



FIG. 435. The plum cur- 

 culio enlarged five 

 times. (After Stedman.) 



tral Illinois in fallen apples it requires from twenty to twenty-six 

 days according to Crandall. When full grown the larva leaves 



FIG. 436. Larvae of the plum curculio enlarged five times. (After Stedman.) 



the fruit and enters the soil, where it forms a small cell an inch 

 or two below the surface, in which it transforms to a white pupa. 

 Three or four weeks elapse before the emergence of the adult 



