16 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Table 13. — Life cycle of the first generation of the codling moth as observed by 

 rearing, bagged-fruit feeding method, Yakima, Wash., 1919. 



Date of 

 egg de- 



Num- 

 ber of 

 indi- 



LarvaMeeding 

 l n . period. 



Cocooning period. | Pupal period. 



Life cycle. 1 

























position. 



vid- 



tion. 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- Avor- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 





uals. 





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. 



May 26 



2 



12 2.5. 00 



26 



24 



5.50 



6 



5 i 12.00 



12 



12 



54.50 



55 



54 



June 1 



3 



1 1 24. 33 



26 



22 



4.67 







4 11.67 



13 



11 



51.67 



00 



48 



1 



3 



12 , 26. 67 



28 



25 



4.67 







4 | 12. 33 



13 



12 



55.67 



58 



53 



3 







13 ' 24. 00 



26 



22 



4.60 



6 



4 12. 60 



14 



10 



54.20 



59 



49 



3 



4 



14 23. 50 



25 



22 



5.00 



6 



4 13. 00 



14 



12 



55. 50 



S'i 



54 



4 



2 



14 ' 25. 50 



27 



24 



5.00 



6 



4 J 13. 00 



13 



13 



57. 50 



60 



DO 







6 



14 i 23.17 



26 



20 



5.33 



6 



4 ; 17. 83 



44 



11 



60.33 



88 



50 



8 



11 



12 24. 55 



30 



22 



5.36 



/ 



5 1 13. 73 



19 



11 



55.64 



63 



50 



8 



3 



13 i 22. 67 



24 



21 



4.00 







3 11.67 



12 



11 



51.34 



52 



50 



12 



5 



11 23. 40 



27 



21 



5.20 



6 



5 12.40 



14 



11 



52.00 



0* 



48 



15 



4 



9 1 25.25 



29 



22 



4.75 



6 



4 22. 25 



44 



13 



61.25 



SO 



51 



48 



12.25 24.23 



30 



20 



5.00 | 7 



3 14. 19 



44 



10 



55. 67 



88 



48 



1 Add 1.63 days for complete life cycle. 



THE SECOND GENERATION. 

 EGGS OF THE SECONr BROOD. 



Time of deposition. — The first eggs of the second brood were 

 deposited by first-brood moths on July 15, and eggs were deposited 





> 



040 



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. 



020 





























700 























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I 





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Z20 

 700 



n 



,— > 





N 



m 



r .. 









- 



r\/ \ i 



\ 



i 



y\ 



y 



V 



'\ 



A 







- 



V V 





■S 





V 



s 





\ 



■n 





r\ 



> 1 



N 600 



\ 5JS 





















\ 



\\ Ji 



A / 



\ 





















\ 



U/'v 



fv 



\ . 









































































































- 



^, .««? 



- 





















- 



q **0 





£ 







n 



1 











- 





8 







zt 







1 











- 



\ 4O0 



^ 460 

 % 440 

 \ 420 

 |i 400 

 \ 300 









1 









\ 











- 









i 



















- 

















\ 











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X 













h 









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-\\ 









11 1 





/ 









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1 \ J 









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J 320 











: 



1 i j\l 1/ 









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\ 200 

 % *** 













Xt 



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v/ 







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II 





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. 



fl 







1 







*I*L - 







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ll\ 









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/<30 

 /60 

 /40 

 /^0 

 /00 



ao 

 60 

 +0 

 ^0 







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i 



jp 









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- 





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1 





y 





1 

 1 







- 

















i 











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i 























' f^ 





















\ 







- f 





I 

















V 







»/ 























.'■■ 



> 



fi /j 



? 2 



*» 2 



9 J 



r <t 



» A. 



T /£. 



? A 



3 J 



a * 



? r 



/2 A 



' 2*. 



Fig. 7.— Time of deposition of eggs of the second brood of the oodling 

 moth at Yakima, Wash., L919. 



daily until September 20, as shown in Figure 7. The maximum 

 period of oviposition is loss decided and much longer than that of 

 the spring brood of moths (see p. 9). It extended from the latter 

 part of July until nearly the last of August, A\'ith an actual maximum 

 of 829 eggs on -July 29, 



