THE CODLING MOTH 



(Carpocapsa pomonella L.) 

 By HAROLD R. HAGAN 



The Utah Experiment Station bulletins originally published, 

 outlining satisfactory methods for reducing injury fty the codling: 

 moth, are no longer available for distribution. This circular 

 contains in briefer form the essential information for controlling 

 the pest. 



LIFE HISTORY 



The moths appear from one to three weeks after blossoming 

 time of the apples and lay their eggs usually on the upper side 

 of the leaves. The female lays from twenty-five to fifty eggs 

 and then dies. The eggs hatch in about ten days and the worms 

 crawl into the calyx end of the apple and eat their way to the 

 core. The larvae of this brood become full grown in fifteen or 

 twenty days, then crawl down the tree to find some place of 

 shelter either under the bark or under the leaves and rubbish. 

 There they pass the pupal or resting stage. During this resting 

 stage they change from worms to moths. 



The first day after reaching a hiding place they spin cocoons 

 and within these silken sack-like cocoons the pupae are formed. 

 The pupal stage lasts from ten to twenty days. The pupal case 

 bursts at the end of this time and the second brood of adult 

 moths appears. This is about the last of July or the first of 

 August, depending considerably on the climate. Eggs are laid by 

 this brood all during the month of August. It takes, on an aver- 

 age, seven days for the eggs to hatch at this time of the year. 

 The worms hatching from these eggs bore into the side of the 

 fruit and eat the pulp, usually penetrating to the core. They 

 become full grown in twenty days, then seek shelter under rough 

 bark, bands, or rubbish to pass the winter. 



As soon as a shelter is found they spin cocoons and remain 

 as larvae over winter in these retreats. Just before blooming 

 time next spring these larvae change to pupae and in about three 

 weeks the adult moths come forth from the pupae. This in brief 

 is the life cycle of the codling moth. (See chart on the cover.) 



CONTROL MEASURES 



Spraying : In controlling the codling moth the most import- 

 ant feature of the work is to apply an efficient spray at the right 

 time. A first-class pump maintaining a pressure of about 150 

 pounds is necessary. A hand pump may suffice for a very small 

 orchard, but for a large orchard a power outfit is imperative. 

 Spraying should be done from the top of a scaffold or ladder so 

 that the man doing the spraying is a little above the center of 



