64 



BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



Table XLIII. — Length of life of male and female coaling moths of the first 

 brood in captivity: Summary of records of 3,231 individual moths, Grand 



Junction, Colo., 1916 



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 

 14 



11 



12 



8 



18 



13 



36 



49 



107 



151 



137 



141 



124 



102 



103 



Days. 

 1 

 2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 

 13 

 14 



6 



9 



7 



15 



20 



33 



70 



99 



147 



172 



195 



156 



169 



142 



Days. 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 



76 

 81 

 75 

 65 

 56 

 51 

 42 

 35 

 22 

 12 

 13 

 5 

 4 

 1 



Days. 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 



Ill 



89 



65 



51 



40 



29 



18 



12 



9 



4 



1 



1 











Days. 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 



5 

 4 

 

 1 

 

 

 

 

 



1 



Days. 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 





 

 

 

 

 

 

 

 

 



Total- 



1,561 



Total.. 



1,670 



Average length of life of male moths, 13.12 days ; female moths, 12.20 days. 

 Maximum length of life of male moths, 38 days ; female moths, 26 days. 

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



Life Cycle of the First Generation. 



Life cycle, stock- jar feeding method. — The summarized data 

 giving the average length of each stage in the life cycle of the codling 

 moth, first generation, are given in Table XLIV. These data are 

 derived from the observations of 550 individuals reared by the stock- 

 jar feeding method. By reference to this table it will be found 

 that the average length of the incubation period was 7.67 days, 

 larval feeding period 19.33 days, cocooning period 5.61 days, and 

 pupal period 12.26 days. The average life cycle was 44.89 days and 

 the average complete life cycle 47.10 days, obtained by adding to the 

 life cycle 2.21 days, which is the average time that elapsed from 

 the emergence of the moths to the deposition of the first egg. 



Life cycle, bagged-fruit feeding method. — In Table XLV the re- 

 sults of rearing 188 individuals of the first generation from the egg 

 to the adult stage, bagged-fruit method, are given. By reference to 

 this table it will be seen that the average incubation period was 8.56 

 days, the larval feeding period 20.45 days, cocooning period 5.26 days, 

 pupal period 11.86 days, average life cycle 46.37 days, and the aver- 

 age complete life cycle 48.58 days. 



