THE CODLING MOTH IN THE YAKIMA VALLEY. 



15 



Table 11. — Length of life of male and female codling moths of the first brood, 



Yakima, Wash., 1919. 



Male. 



Female. 



Male. 



Female. 



Male. 



Female. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Days. 





Days. 





Days. 





Days. 





Days. 





Days. 





1 







1 



2 



15 



21 



15 



40 



29 



8 



29 



1 



2 



2 



2 



3 



16 



21 



16 



33 



30 



1 



30 



1 



3 



5 



3 



4 



17 



23 



17 



24 



31 



3 



31 



2 



4 



10 



4 



4 



18 



24 



18 



27 



32 



1 



32 







5 



6 



5 



9 



19 



20 



19 



15 



33 



1 



33 



1 



6 



26 



6 



17 



20 



19 



20 



15 



34 



3 



34 







7 



42 



7 



39 



21 



15 



21 



19 



36 







36 



1 



8 



41 



8 



56 



22 



13 



22 



15 



37 







37 



1 



9 



45 



9 



66 



23 



8 



23 



7 



38 



1 



38 







10 



40 



10 



73 



24 



8 



24 



11 



39 



2 



39 







11 



26 



11 



62 



25 



9 



25 



9 



44 



1 



44 







12 



32 



12 



55 



26 



6 



26 



6 



45 



1 



45 







13 



14 



35 

 26 



13 

 14 



40 

 27 



27 

 28 



7 

 3 



27 

 28 



4 

 5 











Total. 



555 



Total. 



694 



Average length of life of male moths, 13.97 days; female moths, 13.09 days. 

 Maximum length of life of male moths, 45 days; female moths, 37 days. 

 Minimum length of life of male moths, 2 days; female moths, 1 day. 



LIFE CYCLE OF THE FIKST GENERATION. 



Life cycle, stock-jar feeding method. — Table 12 gives the life cycle of 

 78 individuals of the first generation, all of which were reared from egg 

 to moth, the larvae being fed by the stock- j ar method. The incubation 

 period averaged 12.18 days, larval feeding period 23.59 days, co- 

 cooning period 7.69 days, pupal period 13.33 days; a total of 56.79 

 days for the life cycle. In order to arrive at the complete life cycle 

 from deposition of first-brood egg to deposition of second-brood egg 

 1.63 days should be added, which is the average interval between 

 emergence of the first-brood moth and egg deposition. This gives a 

 complete cycle of 58.42 days. 



Table 12. — Life cycle of the first generation of the codling moth as observed by 

 rearing, stock-jar feeding method, Yakima, Wash., 1919. 





Num- 





Larval feeding 



Cocooning period. 



Pupal period. 



Life cycle. 1 



Date of 

 egg de- 



ber of 

 indi- 



In- 

 cuba- 













































position. 



vid- 

 uals. 



tion. 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 







age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 







Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Day. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



June 2 



5 



12 



25.40 



28 



24 



8.60 



25 



4 



13.00 



15 



11 



59.00 



80 



51 



3 



6 



13 



25.83 



28 



22 



6.50 



11 



4 



12.83 



16 



10 



58.16 



64 



53 



4 



12 



14 



24.08 



31 



21 



6.83 



15 



5 



13.50 



15 



12 



58.41 



74 



53 



5 



7 



14 



23.86 



32 



19 



13.00 



21 



4 



12.14 



14 



10 



63.00 



74 



48 



7 



14 



13 



24.07 



30 



20 



7.28 



19 



4 



14.42 



37 



11 



58.77 



82 



49 



8 



15 



13 



23.07 



33 



20 



6.67 



28 



4 



13.27 



15 



10 



56.01 



78 



49 



12 



2 



10 



23.50 



24 



23 



5.50 



6 



5 



13.00 



13 



13 



52.00 



52 



52 



12 



4 



11 



22.50 



24 



21 



14.25 



26 



5 



12.00 



12 



12 



59.75 



72 



49 



15 



1 



9 



23.00 



23 



23 



6.00 



6 



6 



14.00 



14 



14 



52.00 



52 



52 



17 



11 



8 



21.91 



24 



18 



5.82 



10 



4 



13.64 



15 



9 



49.37 



53 



45 



20 



1 



8 



18.00 



18 



18 



5.00 



5 



5 



12.00 



12 



12 



43.00 



43 



43 



78 



12.18 



23.59 



33 



18 



7.69 



28 



4 



13.33 



37 



9 



56.79 



82 



43 



1 Add 1.63 days for complete life cycle. 



Life cycle, bagged-fruit feeding method. — In Table 13 are shown the 

 life-cycle figures for 48 individuals of the first generation, the larvse 

 of which were fed by the bagged-fruit method. 



