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. 



t „„fv, ; Num- 

 ifuS h berof 

 ofllfe - Whs. 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber or 

 moths. 



Days. 

 1 

 2 

 3 



4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 





 2 

 5 

 10 

 6 

 26 

 42 

 41 

 45 

 40 

 26 

 32 

 35 

 26 



Days. 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 



2 

 3 

 4 

 4 

 9 

 17 

 39 

 56 

 66 

 73 

 62 

 55 

 40 

 27 



Days. 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 



21 

 21 

 23 



24 



20 



19 



15 



13 



8 



8 



9 



6 



7 



3 



Days. 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 



40 



33 



24 



27 



15 



15 



19 



15 



7 



11 



9 



6 



4 



5 



Days. 

 29 

 30 

 31 

 32 

 33 

 34 

 36 

 37 

 38 

 39 

 44 

 45 



Total. 



8 

 1 

 3 

 1 

 1 

 3 

 

 

 1 

 2 

 1 

 1 



Days. 

 29 

 30 

 31 

 32 

 33 

 34 

 36 

 37 

 38 

 39 

 44 

 45 



Total. 



1 

 1 

 2 

 

 1 

 

 1 

 1 

 

 

 

 



555 



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 FIRST 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 oi 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 



ber of 



In- 





















egg de- 



indi- 



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. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days.] Days. 



June 2 







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 



5S. 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 



1? 



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 larvae 

 of which were fed by the bagged-fruit method. 



