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 



nod. 1 



Co- 

 coon- 

 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- 

 eoon- 

 ing 

 pe- 

 riod. 



Pu- 

 pal 

 pe- 

 riod. 



Feed- 

 ing 

 pe- 

 riod 

 (win- 

 tering 

 lar- 

 va).! 



1919 



1920 



Days. 

 31.63 

 33.56 

 29.53 



Days. 

 5.53 

 6.87 

 2.47 



Days. 

 12. 73 

 10.60 

 9.31 



Days. 

 23.82 

 19.05 

 25.83 



Davs. 

 6:99 

 5.48 

 6.12 



Days. 

 13.91 

 12.37 

 12.62 



Days. 

 1.63 

 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 

 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 adxdt codling moth, Yakima, 



Wash., 1919-1921. 



Phase and year. 



Minimum. 



Average. 



Maximum. 



Number of days before opposition 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 



3. 78 



14.96 



15.70 

 13.56 



16.68 



17. (VI 



1 1. 29 



18 



1920 



22 



1921 



18 



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

 1919 



IS 



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 





Length of life of male motbs of the spring brood: 



1919... 



28 



1920 



43 



1921. 



33 



Length of life of female moths of the sprinsr brood: 



L919 



29 



1920... 



" 



1921 . . 



35 



Number of days before oviposition bv first-brood moths: 



1919. 



4 



1920 



14 



L931 



7 



Number of days before maximum oviposltiorj by first-brood moths: 

 1919 



11 



[920. 



IS 



1921 



9 



Number of days of oviposition by first-brood moths: 



1919 



24 















29 



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



moth-: 



L919 



26 



L920 



29 



192] 



29 



