44 



BULLETIN 252, U. S. DEPARTMENT OF AGRICULTURE. 



Table XXXVI. — Life cycle of first generation of codling moth as observed by rearing 

 at Winthrop, Me., 1914, stock-jar feeding method. 



No. of 

 obser- 

 vation. 



Date of — 



Days for — 



Egg dep- 

 osition. 



Hatch- 

 ing. 



Larvae 

 leaving 

 the fruit. 



Pupa- 

 tion. 



Emer- 

 gence of 

 moths. 



Hatch- 

 ing. 



Feed- 

 ing. 



Making 



of 

 cocoon. 



Pupal 

 period. 



Life 



cycle. 1 



1? 



June 24 



July 6 



July 24 



July 27 



Aug. 11 



12 



18 



3 



15 



48 



2c? 



...do 



...do 



July 27 



Aug. 3 



Aug. 17 



12 



21 



V 



14 



54 



39 



June 27 



July 8 



...do 



...do 



...do 



11 



19 



7 



14 



51 



4? 



...do 



...do 



July 28 



Aug. 6 



Aug. 20 



11 



20 



9 



14 



54 



5c? 



...do 



...do 



July 29 



Aug. 5 



Aug. 18 



11 



21 



7 



13 



52 



62 



July 1 



July 9 



...do 



Aug. 2 



Aug. 16 



8 



20 



4 



14 



46 



79 



July 3 



July 10 



July 27 



Aug. 4 



Aug. 18 



7 



17 



8 



14 



46 



8 2 



...do 



...do 



July 31 



Aug. 6 



Aug. 20 



7 



21 



6 



14 



48 



99 



July 5 



July 13 



Aug. 2 



Aug. 9 



Aug. 27 



8 



20 



7 



18 



53 



A^ 







9.666 

 12 

 7 



19. 666 

 21 

 17 



6.444 

 9 

 3 



14. 444 

 18 

 13 



50. 222 

 54 

 46 



M 







M 













1 Add 4 days for complete life cycle. 



Table XXXVII. — Life cycle of first generation of codling moth as observed by rearing 

 at Winthrop, Me., 1914, bagged-fruit feeding method . 



No. of 

 obser- 

 va- 

 tion. 



Date of— 



Days for — 



Egg dep- 

 osition. 



Hatch- 

 ing. 



Larva 

 leaving 

 the fruit. 



Pupa- 

 tion. 



Emerg- 

 ence of 

 moths. 



Hatch- 

 ing. 



Feed- 

 ing. 



Mak- 

 ing of 



co- 

 coon. 



Pupal 

 period. 



Life 



cycle.i 



1 



2c? 

 3 c? 



July 8 

 July 11 

 July 12 



July 15 

 July 17 

 July 19 



Aug. 10 

 ...do.... 



Aug. 14 



Aug. 15 

 Aug. 18 

 Aug. 17 



Sept. 2 

 Sept. 5 

 Sept. 3 



7 

 6 



7 



26 

 24 

 26 



5 

 8 

 3 



18 



18 

 17 



56 

 56 

 53 







6.666 

 7 

 6 



25. 333 

 26 

 24 



5.333 



8 

 3 



17. 666 

 18 

 17 



55 

 56 

 53 









Minimum . 











i Add 4 days for complete life cycle. 



A summary of Tables XXXVI and XXXVII is given in Table 

 XXXVIII, which shows that the average life cycle of the first genera- 

 tion of all individuals was 51.416 days. The complete life cycle 

 would be about 55-56 days. 



Table XXXVIII. — Summary of life cycle of first generation of codling moth, Winthrop, 



Me., 1914. 





Number 

 of obser- 

 vations. 



Larval 

 feeding 

 method. 



Days for — 



Hatch- 

 ing. 



Feed- 

 ing. 



Making 

 of cocoon. 



Pupal 

 period. 



Life 

 cycle. 1 



Average life cycle 



Do 



9 

 3 

 12 



A 



B 



A+B 



9.666 

 6.666 

 8.916 



19. 666 

 25. 333 

 21. 082 



6.444 

 5.333 

 6.166 



14. 444 

 17. 666 

 15. 249 



50. 222 

 55.000 

 51. 416 



Average of all life cycles . 



1 Add 4 days for complete life cycle. 

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



