CODLING MOTH IN SANTA CLARA VALLEY, 



155 



LIFE CYCLE OF FIRST GENERATION, 



Along with other rearing experiments to obtain the length of the 

 egg stage and the feeding periods of the larva? a number of adults 

 were reared from the egg to ascertain the complete life cycle. In this 

 experiment only six individuals were carried through the entire 

 period and the details of the work are shown in Table XLIV. 



Table. XL V is a summary of Table XLIV and shows that the aver- 

 age life cycle from egg to egg (allowing 3 days after the moths emerge 

 before eggs are laid) was 71.3 days, the maximum 77 days and the 

 minimum 67 days. Adding the average egg stage, or 12.77 days, the 

 average feeding period, or 25.08 days, the average post-larval stage, 

 or 9 days, the average pupal stage, or 23.12 days, and allowing 3 days 

 for eggs to be deposited after the moths emerge, a total of 72.95 days 

 is obtained, or very close to the average life cycle, from actual rearing 

 experiments. 



Table XLIV. — Life cycle of the first generation. 



No. of individual. 



Date of- 



Larva 



entering 

 apple. 



Larva 

 leaving 

 apple. 



Pupa- 

 tion. 



June 17 

 June 19 

 ..do.... 

 ..do.... 

 June 20 

 June 28 



July 12 

 Julv 17 



July 13 

 July 17 

 July 23 



July 13 



July 26 



July 23 



July 31 



July 27 



Julv 30 



Length 



of larval 



stage. 



Days. 



Emer- 

 gence of 

 adult. 



Aug. 5 



Aug. 17 

 Aug. 13 

 Aug. 21 

 Aug. 18 

 Aug. 22 



Length 



of pupal 



stage. 



Length 

 of life 

 cycle. 



Eggs to 

 adult. 



Total 



length of 



life cycle. 



Egg to 



egg- 



Days 



Days. 



67 



::<. 

 "9 

 77 

 72 

 70 



Table XLV. — Sum mart/ of Tabic XLIV. 



Observation. 



56602°— Bull. 115 pt 3—13- 



! Totallife 



cycle. Egg 



to adult. 



Days. 



Average 68. 3 



Maximum 74 



Minimum 64 



Total life 



cycle. Egg 



to egg. 



71.3 



77 



67 



