LIFE HISTORY OF CODLING MOTH IN PECOS VALLEY, N. MEX. 31 



Table XXIX. — Length of life cycle of the third generation of the codling moth, Roswell, 



N. Mex., 1912. 



Date of egg 

 deposition. 



Num- 

 ber of 

 indi- 

 vidu- 

 als. 



Moths emerged in specified days from time of deposi- 

 tion of eggs of the same generation. 



Aver- 

 age 

 days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum, 

 days. 



Total 

 days. 



36 



40 



41 



44 



45 



46 



47 



48 



49 



50 



51 



52 



54 



55 



60 



62 



July 24 



28... 



2 

 2 

 4 

 3 

 3 

 1 

 2 

 1 







1 







1 























43.5 

 55.0 

 51.5 

 45.7 

 50.3 

 47.0 

 50.5 

 40.0 

 44.0 



41 

 48 

 45 

 36 

 48 

 47 

 47 

 40 

 44 



46 

 62 

 60 

 51 

 55 

 47 

 54 

 40 

 44 



87 









1 

















1 



110 



29 











1 







1 



Y 



"i" 



1 







1 



206 



30.. .. 



1 















137 



Aug. 2 



3 















2 









1 







151 















1 













47 



4 

























1 









101 



9 





1 



























40 



10 





1 



























44 







































19 



1 



1 



1 



1 



1 



1 



2 



3 



1 



i 



i 



1 



1 



1 



1 



1 



48.57 







923 











In Table XXX is brought together a condensed summary of 

 records dealing with the codling moth of the third generation, show- 

 ing the average length of the separate periods composing the life 

 cycle of the insect. The average of the averages secured from the sev- 

 eral stages recorded gives a total of 47.62. This sum when contrasted 

 with the results as given in Table XXIX, shows a difference of but 

 0.95 days. 



Table XXX. — Summary records on the time of development of the codling moth of the 

 third generation in its stages of egg, larva, and pupa, Roswell, N m Mex., 1912. 





'-3 

 .9 _ 



3 



r 



3 



i 



3 

 o 



.9 . 

 a 



ta 



'-3 



.9 . 



co 



z> 



a 



3 



Length of 

 feeding larvae. 



.9 ; 



<« co 

 0*03 



3 



ss 

 a 



Length of co- 

 coon ing period. 



=3 

 .9 < 



„_, co 



Od 



3 



*-"0 



«.« 



■a > 



a 



3 



Length of 

 pupal stage. 



'3 

 .9 < 



<w CO 



r 



3 



Totallength of 

 life cycle. 



Date of egg 

 deposition. 



» o? 



< 



a 



H 



'•* 03 



a 



u 



< 



a 

 a£ 



a 



a t>> 



a -3 



< 



a 



2 



a 



3 . 



® 03 



«4 



a 



P 



.9^ 



a 



3 . 



'oil" 



July 23 



2 

 3 

 2 

 2 

 3 

 4 

 3 

 5 

 1 

 3 

 1 



30 



10 

 15 

 12 

 12 

 18 

 24 

 18 

 25 

 5 

 15 

 5 

 5 



2 

 3 

 2 

 2 

 3 

 4 

 3 

 5 

 1 

 3 

 1 



19.5 

 19.0 

 18.5 

 25.0 

 24.0 

 21.3 

 22.0 

 21.2 

 20.0 

 23.0 

 16.0 

 20.0 



18 

 18 

 17 

 25 

 23 

 20 

 16 

 16 

 20 

 21 

 16 

 20 



21 

 21 



20 



25 

 26 

 23 

 26 

 25 

 20 

 27 

 16 

 20 



2 

 2 

 2 

 2 

 3 

 4 

 1 

 5 

 1 

 3 



1 



4.0 

 3.5 

 3.5 

 5.5 

 11.0 

 10.0 

 8.0 

 6.2 

 8.0 

 6.7 

 4.0 

 4.0 



4 

 3 

 3 



5 



7 



8 

 8 

 2 

 8 

 5 

 4 

 4 



4 

 4 

 4 



6 

 14 

 12 



8 

 9 

 8 

 8 

 4 

 4 



















24 



2 



15.5 



11 



20 



2 



43.5 



41 



46 



26 





27 



















28 



2 

 4 

 1 

 3 

 1 

 2 

 1 

 1 



15.5 

 14.3 

 13.0 

 16.0 

 14.0 

 15.0 

 15.0 

 15.0 



12 



11 



13 

 14 

 14 



lo 

 15 



19 

 20 

 13 

 19 

 14 

 17 

 15 

 15 



2 

 4 

 3 

 3 



1 

 2 

 1 

 1 



55.0 

 51.5 

 45.6 

 51.5 

 47.0 

 50.5 

 40.0 

 44.0 



48 

 45 

 36 

 48 

 47 

 47 

 40 

 44 



62 



29 



60 



30 



Aug. 2 



51 

 55 



3... 



47 

 54 

 40 

 44 



4 



9 



10 







164 



30 



21.23 







27 



6.7 







17 



14.9 







19 



47.61 

























Average length of incubation period in days, 5.46. 



SEASONAL HISTORY OF THE CODLING MOTH DURING 1912. 



In figure 4 a smnmary is given in graphical form to illustrate the 

 progress of the development of the codling moth in the course of 

 the entire season of 1912. The shaded portions are arranged to repre- 

 sent the periods in which the insect was prevalent in greatest numbers 

 as determined by the average length of the several stages. The 

 V-shaped characters appearing before the shaded portions show the 

 55888°— Bull. 429—17 3 



