74 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Table 62. — Summary of the average length of the different periods in the life cycle 

 of the codling moth, Yakima, Wash., 1919, 1920, 1921. 



Spring brood. 



First generation. 



Second generation. 



Season. 



Pu- 

 pal 

 pe- 

 riod. 



Pre- 

 ovi- 

 posi- 

 tion 

 pe- 

 riod. 



Incu- 

 ba- 

 tion 

 pe- 

 riod. 



Feed- 

 ing 

 pe- 

 riod. 1 



Co- 

 ceon- 

 ing 

 pe- 

 riod. 



Pu- 

 pal 

 pe- 

 riod. 



Pre- 

 ovi- 

 posi- 

 tion 

 pe- 

 riod. 



Life 



cycle. 



Incu- 

 ba- 

 tion 

 pe- 

 riod. 



Feed- 

 ing 

 pe- 

 riod 

 (trans- 

 form- 

 ing 

 lar- 

 vae). 1 



Co- 

 coon- 

 ing 

 pe- 

 riod. 



Pu- 

 pal 

 pe- 

 riod. 



Feed- 

 ing 

 pe- 

 riod 

 (win- 

 tering 

 lar- 

 vae). 1 



1919 



Bays. 

 31.63 

 33.56 

 29; 53 



Days. 

 5.53 

 6.87 

 2.47 



Days. 

 12.73 

 10.60 

 9.31 



Days. 



23. S2 

 19.05 

 25.83 



Davs. 



5.48 

 6.12 



Days. 

 13. 91 

 12.37 

 12.62 



Davs. 

 L63 

 2.93 



1.74 



Days. 

 58.42 

 48.01 

 55.88 



Days. 

 8.72 

 8.74 

 7.70 



Days. 

 21.80 



Days. 

 7.20 



Days. 

 16.00 



Days. 

 34.51 



1920 



35.30 



1921 



16.60 



2.50 



17.67 



34.02 







Grand average.. 



31. 57 



4.96 



10.88 



22.90 



6.20 



12.97 



2.10 



54.10 



8.39 



19.20 



4.85 



16.84 



34.61 



1 Stock-jar method. 



The various phases in the life of the adult codling moths for the 

 three seasons are compared in Table 63. 



Table 63. — Summary of the phases in the life of the adult codling moth, Yakima, 



Wash., 1919-1921. 



Phase and year. 



Minimum 



Average. 



Maximum. 



Number of --days before oviposition by spring-brood moths: 



1919 



1 

 1 



1 



3 

 3 

 2 



2 

 1 

 9 



8 

 9 

 11 



1 



5.53 

 6.83 

 2.47 



9.93 

 12.45 

 5.53 



14.67 

 15.03 

 19.11 



19.20 

 20.70 

 20.58 



6.36 

 6.71 

 19.77 



15.33 

 16.65 

 12.29 



16.91 

 17. 73 

 13.85 



1.63 

 2.93 

 1.74 



4.21 

 5.55 

 3.79 



14.95 

 15.70 

 13.56 



15. 58 



17.64 

 11.29 



18 



1920 



22 



1921 



18 



Number of days before maximum oviposition by spring-brood moths: 

 1919 



18 



1920 



23 



1921 



18 



Number of days of oviposition by spring-brood moths: 



1919 



24 



1920 



27 



1921 



27 



Number of days from emergence to last oviposition by spring-brood 

 moths: 



1919 



28 



1920 



34 



1921 . 



27 



Number of eggs per female moth of the spring brood: 



1919 



86 



1920 





1921. 



1 



1 

 2 

 2 



2 

 2 

 2 



1 

 1 

 1 



1 

 1 

 2 



9 

 5 

 1 



9 

 9 

 7 



94 



Length of life of male moths of the spring brood: 



1919 



28 



1920... 



43 



1921 . 



33 



Length of life of female moths of the sprins brood: 



1919 



29 



1920 



45 



1921 



35 



Number of days before oviposition by first-brood moths: 



1919 



4 



1920 



14 



1921 



7 



Number of days before maximum oviposition bv first-brood moths: 

 1919 



14 



1920 . . 



18 



1921 . 



9 



Number of davs of oviposition by first-brood moths: 



1919 



24 



19^0 



26 



1921 . . 



29 



Number of days from emergence to last oviposition by first-brood 

 moths: 

 1919 



26 



1920 .. . 



29 



1921 



29 



