CODLING MOTH IN SANTA CLARA VALLEY. 



155 



LIFE CYCLE OF FIRST GEXERATIOX. 



Along with other rearing experiments to obtain the length of the 

 egg stage and the feeding periods of the larvse 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 XLV 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. 





Sex. 



Date of— 



Length 



No. of individual. 



Deposi- 

 tion. 



Red ring. 



Black 



spot. 



Larva 

 hatching. 



of egg 

 stage. 



1 



cT 

 V 



cf 



8 



cf 



? 



June 2 

 June 8 



...do.... 



...do.... 

 June 10 



...do.... 



June 5 

 June 10 

 June 11 

 ...do.... 

 June 12 

 June 18 



June 15 

 June 18 



...do.... 



...do.... 

 June 19 

 June 26 



June 17 

 June 19 



...do.... 



...do.... 

 June 20 

 June 28 



Days. 

 15 



2 



3 



11 

 11 



4 



11 



5 



10 



6 



12 









Date of— 



Length 

 of larval 



stage. 



Emer- 

 gence of 

 adult. 



Length 



of pupal 



stage. 



Length 

 of life 

 cycle. 



Eggs to 

 adult. 



Total 

 length of 



No. of individual. 



Larva 



entering 



apple. 



1 

 , Lar ™ | Pupa- 

 le a^ g tio P n. 



life cycle. 



Egg to 



egg. 



1 



June 17 



June 19 



.do 



July 12 

 July 17 



July 13 

 July 26 

 July 23 

 July 31 

 July 27 

 July 30 



Days. 

 26 

 37 

 34 

 42 

 37 

 32 



Aug. 5 



Aug. 17 

 Aug. 13 

 Aug. 21 

 Aug. 18 

 Aug. 22 



Days. 

 23 

 22 

 21 

 21 

 22 

 23 



Days. 



64 

 70 

 66 

 74 

 69 

 67 



Days. 

 67 



2 



73 



3 



*9 



4 



...do 



July 13 

 Julv 17 

 July 23 



77 



5.... 



June 20 

 June 28 



72 



6 



70 







Table XLV.— Summary of Table XLIV. 



Observation. 



56602°— Bull. 115 pt 3—13- 



Total life 



cycle. Egg 



to adult. 



Average... 

 Maximum . 

 Minimum. 



Days. 

 68. 

 74 

 64 



Total life 



cycle. Egg 



to egg. 



Days. 

 71.3 



77 

 67 



