48 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Length of life of moths. — Table 41 shows that the average length of 

 life of 356 male moths of the first brood was 11.72 days; of 643 

 females, 11.39 days. 



/2 (7 22 27 



UULY 



6 // /6 21 26 <3I 



5 /O iS 20 25 30 S~ K) 



Fig. 28. — Emergence of the first and second broods of moths of the codling moth at Yakima, 



Wash., 1921. 



Table 41. — Length of life of male and female codling moths of the first brood, Yakima, 



Wash., 1921. 



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. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



3 



1 

 4 

 18 

 14 

 21 

 36 

 20 

 24 

 33 

 29 

 21 

 18 



Days. 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 



3 

 1 



10 

 22 

 21 

 44 

 65 

 37 

 49 

 68 

 46 

 44 

 44 



Days. 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 



19 

 17 

 16 

 9 

 5 

 11 

 5 



12 

 4 

 2 

 2 

 2 



Days. 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 



35 



23 



28 



31 



12 



20 



8 



6 



6 



4 



3 



7 



Days. 

 26 

 27 

 28 

 29 

 30 

 34 

 35 

 37 

 39 

 50 



Total . . 







Days. 

 26 

 27 

 28 

 29 

 30 

 34 

 35 

 37 

 39 

 50 



Total . 



2 

 1 

 1 

 

 

 1 

 

 

 

 1 



356 



643 



Average length of life of male moths, 11.72 days ; female moths, 11.39 days. 

 Maximum length of life of male moths, 39 days,; female moths, 50 days. 

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



LIFE CYCLE OF THE FIRST GENERATION. 



Table 42 shows the periods in the life of 490 individuals of the first 

 generation from the time of deposition of the egg to the emergence 

 of the adult. From this table the average life cycle is found to be 

 54.14 days, to which must be added 1.74 days, the average length of 

 the preoviposition period, to give the complete life cycle from egg to 

 egg, which in this case is 55.88 days. All larvae were brought through 

 the feeding period by the stock-jar method. 



