6 



these and other varieties is variable and depends upon manj^ local con- 

 ditions. Pears are next in the order of infestation. If apples are 

 present, pears are usually not badly infested, but if there are few 

 apples and large numbers of the insect, the pears suffer a heavy loss. 

 This insect has been noted feeding on the quince, prune, plum, peach, 

 and cherry, but never in sufficient numbers to cause any great amount 

 of injury. 



LIFE HISTORY OF THE INSECT. 



A good knowledge of the life history of this insect is the first essen- 

 tial to its control. Every fruit grower should familiarize himself with 

 its different stages by studying the insect in his own orchard. 



Fig. 1. — The Codling Moth: a, the moth or adult insect, slightly enlarged; 6, the egg greatly 

 enlarged; c, the full-grown larva, slightly enlarged; d, the pupa, slightly enlarged; e, the pupa in 

 its cocoon on the inner surface of a piece of bark, reduced about one-half; /, moth on bark and empty 

 pupa skin from which it emerged, about natural size (original). 



HIBERNATION. 



The codling moth passes the winter in the larval stage. The larvae 

 may be found encased in silken cocoons in cracks and holes in the 

 trees and in houses where apples have been stored. In the spring 

 these larvffi change to pupse, from which the moths emerge about a week 

 after the apple is in blossom. 



THE MOTH. 



The adult insect or moth (fig. 1, a) is but little known among fruit 

 growers and other moths are often mistaken for it. It varies some- 

 what in size, but the maximum spread of its wings is about three- 



171 



