LIFE HISTORY OF THE CODLING MOTH IN MAINE. 



23 



Table XVIII. — Life cycle of the first generation of the codling moth, as observed by rearing 

 at Winthrop, Me., 1913, bagged-fruit feeding method. 



No. of 



obser- 

 va- 

 tion. 



1 

 2 

 3 



4 

 5 



6 



8 

 9 



Date of— 



Days for— 



Egg dep- 

 osition. 



Hatching. 



Larva 

 leaving 

 the fruit. 



Pupa- 

 tion. 



Emer- 

 gence 

 of moth. 



Hatch- 

 ing. 



Feed- 

 ing. 



Mak- 

 ing of 

 cocoon. 



Pupal 

 period. 



Life ' 

 cycle. 1 



June 26 

 June 28 



...do.... 



...do.... 



...do.... 

 June 29 



...do.... 

 Julv 1 

 July 3 



July 3 

 July 4 



...do.. .. 



...do.... 



...do.... 

 July 5 



...do.... 

 July 7 

 July 10 



July 27 

 Julv 302 

 July 312 



...do.3.. 

 Aug. 3 2 

 July 30- 

 Aug. 2 2 

 July 313 



...do.s . . 



July 30 

 Aug. 9 

 Aug. 8 

 Aug. 6 

 Aug. 11 

 Aug. 4 

 Aug. 8 

 Aug. 4 

 Aug. 5 



Aug. 14 

 Aug. 26 

 Aug. 27 

 Aug. 23 

 Aug. 26 

 Aug. 17 

 Aug. 27 

 Aug. 18 

 Aug. 19 



7 

 6 

 6 

 6 

 6 

 6 

 6 

 6 

 7 



24 

 26 

 27 

 27 

 30 

 25 

 28 

 24 

 21 



3 

 10 



8 

 6 

 8 

 5 

 6 

 4 

 5 



15 

 17 

 19 

 17 

 15 

 13 

 19 

 14 

 14 



49 

 59 

 60 

 56 

 59 

 49 

 59 

 48 

 47 



A 





6.222 

 7 

 6 



25. 777 

 30 

 21 



6.111 

 10 

 3 



15. 888 

 19 

 13 



54 

 60 



47 











Add 4 days for complete life cycle. 



2 Male. 



3 Female. 



As shown in Table XIX, which is a summary of Tables XVI, 

 XVII, and XVIII, the average of the life cycles was 51.566 days. 

 The complete life cycle would be about 55 to 56 days. 



Table XIX. — Summary of the life cycle of the first generation of the codling moth, 



Winthrop, Me., 1913. 





Number 

 of obser- 

 vations. 



Larval 

 feeding 

 method. 



Days for— 





Hatch- 

 ing. 



Feeding. 



Making 

 of cocoon. 



Pupal 

 period. 



Life 

 cycle.* 





11 



10 



9 



30 



A 



B 



C 



A+B+C 



6.545 

 6.700 

 6.222 

 6.499 



20. 454 

 24. 600 

 25. 777 

 23. 432 



6.545 

 7.0C0 

 6.111 

 6.566 



14. 272 

 15. 200 



15.888 

 15.066 



47. 818 



Do 



53. 500 



Do 



54.000 



Average of all life cycles 



51. 56ft 



1 Add 4 days for complete life cycle. 



A, stock-jar method; B, watered stock-jar method; C, bagged-fruit method. 



THE SECOND GENERATION. 



SECOND BROOD OF EGGS. 



Length of incubation. — Observations on the period of incubation 

 extended from August 15, when the first eggs of the second brood 

 were deposited, until October 15, when the last of the eggs of this 

 brood hatched. A total of 1,013 eggs were laid, of which number 

 972 (95.9 per cent) hatched. The average incubation period was 

 11.862 days; maximum, 23 days; minimum, 7 days. The average 

 time for the appearance of the red ring was 2.884 days; maximum, 

 7 days; minimum, 1 day. The average time for the appearance of 

 the black spot was 9.069 days; maximum, 18 days; minimum, 5 

 days. The incubation observations are recorded in Table XX. 



