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- 



Egg dep- 

 osition. 



Hatch- 

 ing. 



Larvae 

 leaving 

 the fruit. 



Pupa- 



tion 





Julv 



27 



Aug. 



3 



...do.. 





Aug. 



6 



Aug. 



5 



Aug. 



2 



Aug. 



4 



Aug. 



6 



Aug. 



9 



Emer- 

 gence of 

 moths. 



Lavs for- 



Hatch- 

 ing. 



Feed- J ^^S 

 mg * ; cocoon. 



Pupal 

 period. 



Life 

 cvcle.i 



1$ 

 2c? 

 39 

 49 

 5 c? 

 69 

 79 

 89 

 9 9 I July ! 



Average . . . 

 Maximum. 

 Minimum . 



June 24 July 6 , July 24 

 ...do do July 27 



June 27 Julv 8 j...do 



...do I... do Julv 28 



...do !...do ] Julv 29 



July 1 July 9 i...do 



July 3 | Julv 10 Julv 27 

 ...do ! ...do July 31 



July 13 Aug. 2 



Aug. 11 

 Aug. 17 



..do 



Aug. 20 

 Aug. 18 

 Aug. 16 

 Aug. 18 

 Aug. 20 

 ] Aug. 27 



» 3 



19. 666 

 21 

 17 



6.444 14.444 50.222 

 18 54 



3 I 13 46 



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. 



1 



2c? 

 3c? 



Davs for- 



Egg dep- 

 osition. 



July 8 

 July 11 

 July 12 



Hatch- 

 ing. 



Larva 

 leaving 

 the fruit. 



Pupa- 

 tion. 



Emerg- 

 ence of 

 moths. 



July 15 



Aug. 10 



Aug. 15 



July 17 



...do 



Aug. 18 



July 19 



Aug. 14 



Aug. 17 



Sept. 2 

 Sept. 5 

 Sept. 3 



Average . . . 

 Maximum. 

 M inimu m 



Hatch- 

 ing. 



Feed- 

 ing. 



Mak- j 



ing of j Pupal 



co- period 



coon 



25.333 5.333 17.666 

 26 8 18 



24 3 17 



Life 

 cycle. 1 



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 Life 

 period. ' cycle. 1 



Average life cvcle 



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 . 



A, stock-jar method; B, 



1 Add 4 days for complete life cycle, 

 fruit method. 



