12 



BULLETIN 429, U. S. DEPARTMENT OF AGRICULTURE. 



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



N. Mex., 1912. 



Summary of records of 778 individual 

 moths. 



Summary of records of 778 individual 

 moths. 



Male. 



Female. 



Male. 



Female. 



Length 

 life. 



Number 



of 

 moths. 



Length 

 life. 



Number 



of 

 moths. 



Length 



of 



life. 



Number 



of 

 moths. 



Length 



of 



life. 



Number 



of 

 moths. 



Bays. 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



2 

 25 



72 

 99 

 98 

 48 

 10 

 8 

 2 



Days. 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 





 10 



25 



44 

 82 

 87 

 57 

 48 

 27 



Days. 

 10 

 11 

 12 

 13 

 14 

 15 

 16 



1 

 1 

 

 

 

 



1 



Days. 

 10 

 11 

 12 

 13 

 14 

 15 

 16 



18 

 7 

 2 

 1 

 1 

 2 

 



367 



411 



Average length of life of male moths, 4.44 days. 

 Average length of life of female moths, 6.24 days. 

 Maximum length of life of male moths, 16 days. 

 Maximum length of life of female moths, 15 days. 

 Minimum length of life of male moths, 1 day. 

 Minimum length of life of female moths, 2 days. 



LENGTH OF LIFE CYCLE OF THE FIRST GENERATION. 



Records of the observations on the hfe cycle of the first generation 

 show that only 7 individuals completed the stages comprising the 

 total life cycle of the insect. From this number an average of 51.14 

 days is found to represent the length of the period from date of 

 deposition of eggs to emergence of moths of the same generation. 

 The maximum period is 61 days; the minimum, 40 days. (See 

 Table XI.) 



Table XI. — Length of life cycle of first generation of codling moth, Roswell, N. Mex., 1912. 



Date of egg deposition. 



Num- 

 ber 

 of 

 indi- 

 vid- 

 uals. 



Moths emerged in specified days from time 

 of deposition of eggs of the same genera- 

 tion. 



Average 

 days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum 



days. 



Total 



days. 





40 



45 



46 



52 



56 



58 



61 





April 26 



1 

 1 



2 

 2 



1 













1 



i 



58 



61 



54 



42.5 



46- 



68 

 61 

 52 

 40 

 46 



58 

 61 

 56 

 45 

 46 



58 



May 10 













61 



11 









1 



1 







108 



20 



1 



1 







85 



27 



1 







1 



46 









1 









7 



1 



1 



1 



1 



1 



1 



1 



51.14 







358 













A summary of results from observations on the separate stages of 

 the first generation of the codling moth shows the total life cycle- of 

 the insect when computed by individual stages to compare very 

 closely with the corresponding figures in Table XI, The length of 

 life cycle by addition of separate stages is found to be 50.62 days as 

 shown in Table XII, a difference of only 0.54 day. 



