CODLING MOTH I1T COLORADO. 



39 



Table XXV. — Time of emergence of codling moths of the second brood, Grand 



Junction, Colo., 1915. 



Date of 

 emer- 

 gence. 



Number 



of 

 moths. 



Date of 

 emer- 

 gence. 



Number 



of 

 moths. 



Aug. 23 

 25 

 29 



Sept. 1 

 6 



7 

 10 



1 

 1 

 2 

 1 



1 

 2 

 2 



Sept. 12 

 18 

 23 



Oct. 3 



14 



Total... 



1 

 2 

 1 

 1 

 1 



16 



Life Cycle of the Second Generation. 



In Table XXVI are given the summarized data showing the 

 average length of each period in the life cycle of the codling moth as 

 derived from observations of 16 individuals of the second generation 

 reared by the stock- jar feeding method. It will be noted that the 

 average length of the incubation period was 6.12 days, the larval 

 feeding period 20.49 days, the cocooning period 8.56 days, the pupal 

 period 15.62 days, and the average life cycle 50.81 days. 



Table XXVI. — Life cycle of the second generation of the codling moth, as 

 observed by rearing by the stock-jar feeding method, Grand Junction, Colo., 

 1915. 



Date of 



Num- 

 ber of 



Incu- 



Larval feeding 

 period. 



Cocooning period. 



Pupal period. 



Life cycle. 



egg depo- 

 sition. 



indi- 

 vid- 



ba- 

 tion. 



" 













































uals. 





Av. 



Max. 



Min. 



Av. 



Max. 



Min. 



Av. 



Max. 



Min. 



Av. 



Max. 



Min. 







Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



July 13 



2 



6 



18.50 



20 



17 



8.00 



12 



4 



11.50 



12 



11 



44.00 



47 



41 



14 



3 



6 



19.33 



24 



16 



12.66 



16 



10 



13.66 



14 



13 



51.66 



60 



46 



16 



2 



6 



21.50 



25 



18 



5.50 



6 



5 



13.50 



16 



11 



46.50 



53 



40 



21 



1 



6 



20.00 



20 



20 



7.00 



7 



7 



14.00 



14 



14 



47.00 



47 



47 



25 



4 



6 



19.75 



20 



19 



7.75 



10 



6 



16.75 



21 



13 



50.25 



55 



44 



27 



1 



6 



20.00 



20 



20 



5.00 



5 



5 



14.00 



14 



14 



45.00 



45 



45 



31 



1 



6 



28.00 



28 



28 



11.00 



11 



11 



19.00 



19 



19 



64.00 



64 



64 



Aug. 3 



1 



7 



18.00 



18 



18 



12.00 



12 



12 



14.00 



14 



14 



51.00 



51 



51 



6 



1 



7 



25.00 



25 



25 



6.00 



6 



6 



31.00 



31 



31 



69.00 



69 



69 



16 



6.12 



20.49 



28 



16 



8.56 



16 



4 



15.62 



31 



11 



50.81 



69 



40 



