30 



BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



Table XVIII. — Life cycle of the first generation of the codling moth, as observed 

 by rearing, stock-jar feeding method, Grand Junction, Colo., 1915. 



Date of 

 egg depo- 



Num- 

 ber of 

 indi- 



Incu- 

 ba- 



Larval feeding 

 period. 



Coeooning period. Pupal period. 



Life cycle. > 



























sition. 



vid- 

 uals. 



tion. 



Av. 



Max. 



Min. 



Av. 



Max. 



Min. 



Av. 



Max. 



Min. 



Av. 



Max. 



Min. 







Day.?. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



May 13 



1 



14 



27.00 



27 



27 



4.00 



4 



4 



12.00 



12 



12 



57.00 



57 



57 



23 



4 



13 



22.25 



23 



21 



3.50 



5 



3 



10.25 



11 



8 



49.00 



50 



47 



24 



11 



13 



21.45 



25 



19 



5.36 



11 



2 



10.81 



13 



6 



50.63 



54 



48 



24 



1 



14 



20.00 



20 



20 



4.00 



4 



4 



11.00 



11 



11 



49.00 



49 



49 



26 



2 



13 



20.00 



21 



19 



5.00 



8 



2 



9.00 



10 



8 



47.00 



48 



46 



27 



9 



13 



19.77 



23 



18 



5.22 



9 



3 



10.33 



12 



8 



48.33 



53 



45 



29 



11 



12 



20.63 



22 



18 



5.09 



7 



3 



11.27 



13 



10 



49.00 



51 



45 



29 



15 



13 



21.80 



27 



19 



6.66 



9 



3 



13. 26 



31 



9 



54.73 



72 



47 



31 



3 



12 



20. 66 



22 



19 



14.33 



28 



4 



10.66 



12 



9 



57. 66 



70 



46 



June 1 



2 



12 



20.50 



21 



20 



7.00 



7 



7 



10.00 



11 



9 



49.50 



51 



48 



2 



12 



12 



21.08 



25 



18 



9.25 



23 



3 



11.33 



13 



7 



53.66 



66 



46 



4 



31 



11 



19.83 



27 



14 



6.77 



20 



3 



11.45 



20 



7 



49.06 



65 



39 



6 



15 



10 



22.20 



32 



18 



8.40 



14 



4 



13.13 



21 



9 



53.73 



63 



45 



9 



20 



8 



20.55 



26 



15 



7.55 



14 



2 



11.60 



14 



8 



47.70 



56 



38 



10 



23 



8 



20.86 



29 



17 



7.17 



13 



4 



11.47 



15 



9 



47.52 



56 



40 



11 



13 



8 



20.84 



26 



19 



6.84 



13 



3 



12.38 



25 



10 



48.07 



57 



42 



12 



10 



8 



21.20 



24 



18 



7.60 



11 



4 



12.10 



16 



10 



48.90 



53 



45 



13 



6 



8 



21.00 



24 



19 



6.66 



9 



4 



12.50 



14 



11 



48.16 



52 



45 



15 



3 



7 



24.66 



29 



20 



10.33 



11 



9 



9.66 



11 



8 



51.66 



55 



46 



16 



3 



7 



22.66 



25 



20 



6.66 



10 



2 



12.00 



14 



10 



48. 33 



50 



46 



16 



1 



8 



18.00 



18 



18 



5.00 



5 



5 



13.00 



13 



13 



44.00 



44 



44 



18 



1 



7 



21.00 



21 



21 



12.00 



12 



12 



11.00 



11 



11 



51.00 



51 



51 



19 



3 



7 



20.00 



24 



17 



7.66 



9 



6 



12.00 



15 



10 



46.66 



54 



42 



20 



2 



7 



18.50 



20 



17 



5.00 



6 



4 



11.00 



12 



10 



41.50 



45 



38 



21 



6 



7 



21.50 



26 



16 



7.16 



9 



4 



11.16 



12 



10 



46.83 



53 



44 



21 



4 



8 



17.50 



19 



15 



6.50 



8 



5 



11.00 



12 



10 



43. 00 



46 



38 



23 



2 



7 



19.50 



20 



19 



8.50 



12 



5 



9.50 



11 



8 



44.50 



47 



42 



25 



1 



7 



16.00 



16 



16 



5.00 



5 



5 



11.00 



11 



11 



39.00 



39 



39 



26 



3 



7 



18.33 



23 



16 



6.00 



6 



6 



12.66 



14 



11 



44.00 



50 



40 



27 



2 



7 



17.50 



18 



17 



6.00 



6 



6 



12.00 



12 



12 



42.50 



43 



42 



30 



1 



6 



17.00 



17 



17 



6.00 



6 



6 



12.00 



12 



12 



41.00 



41 



41 



221 



9.91 



20.75 



32 



14 



6.99 



28 



2 



11.64 



31 



6 



49.30 



72 



38 



1 Add 2.07 days for complete life cycle. 



Table XIX. — Life cycle of the first generation of the codling moth, as observed 

 by rearing, bagged-fruit feeding method, Grand Junction, Colo., 1915. 



Date of 

 egg depo- 



Num- 

 ber of 

 indi- 



Incu- 

 ba- 



Larval feeding 

 period. 



Cocoo 



[ling period. 



Pupal period. 



Life cycle. 1 



























sition. 



vid- 

 uals. 



tion. 



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. 



May 16 



1 



15 



32.00 



32 



32 



5.00 



5 



5 



10.00 



10 



10 



62.00 



62 



62 



22 



1 



11 



25.00 



25 



25 



4.00 



4 



4 



10.00 



10 



10 



50.00 



50 



50 



23 



5 



11 



26.40 



30 



23 



4.80 



6 



4 



11.00 



12 



10 



53.20 



59 



49 



23 



8 



12 



27. 37 



32 



23 



6.25 



15 



3 



10.62 



13 



9 



56.25 



63 



50 



23 







13 



21.80 



23 



21 



4.60 



6 



4 



10.40 



11 



10 



49.80 



51 



49 



24 



8 



13 



21.12 



22 



21 



4.12 



5 



3 



10.75 



13 



9 



49.00 



52 



48 



24 



9 



14 



22.22 



25 



21 



5.66 



8 



4 



10. 55 



12 



9 



52.44 



57 



49 



26 



3 



13 



26.33 



27 



26 



7.33 



12 



4 



9.00 



11 



8 



55.66 



60 



51 



27 



6 



13 



23.66 



27 



20 



9.33 



22 



1 



12.33 



17 



10 



58. 33 



74 



49 



29 



4 



12 



19.50 



21 



18 



7.00 



8 



6 



10. 25 



11 



9 



48.75 



50 



47 



29 



2 



13 



19.00 



20 



18 



5.00 



5 



5 



11.50 



12 



11 



48.50 



50 



47 



31 



1 



12 



19.00 



19 



19 



4.00 



4 



4 



11.00 



11 



11 



46.00 



46 



46 



June 1 



5 



12 



21.20 



26 



19 



4.80 



6 



4 



10.80 



12 



9 



48.80 



55 



44 



2 



2 



12 



21.50 



23 



20 



3.00 



4 



2 



11.50 



12 



11 



48.00 



51 



45 



4 



3 



11 



20.33 



21 



20 



4.66 



5 



4 



11.00 



12 



10 



47.00 



48 



46 



6 



5 



10 



21.40 



28 



16 



5.40 



8 



4 



9.60 



11 



8 



40. 40 



54 



42 



9 



4 



8 



20. 50 



21 



19 



4.25 



5 



3 



11.50 



13 



10 



44.26 



46 



41 



10 



3 



8 



Tl. 33 



28 



19 



9.66 



15 



6 



13. 33 



15 



11 



53.33 



57 



46 



13 



8 



8 



23.25 



29 



21 



4.75 



7 



4 



12.75 



19 



11 



48.75 



53 



44 



16 



4 



8 



21.75 



24 



20 



4.25 



5 



4 



11.75 



12 



11 



45. 75 



48 



43 



18 



1 



7 



21.00 



21 



21 



5.00 



5 



5 



12.00 



12 



12 



45.00 



45 



45 



19 



4 



7 



22.50 



24 



20 



4.50 



6 



3 



10.75 



12 



10 



44.75 



47 



43 



21 



3 



7 



17.00 



19 



15 



4.33 



5 



4 



10.66 



11 



10 



39.00 



41 



36 



21 



3 



8 



21.33 



25 



19 



4.66 



5 



4 



11.66 



12 



11 



45.66 



50 



43 



23 



3 



7 



18.00 



20 



16 



4.00 



5 



3 



10.00 



11 



9 



39.00 



41 



38 



24 



4 



7 



20.50 



21 



20 



4.75 



6 



4 



12.25 



16 



10 



44.50 



50 



42 



25 



4 



7 



18.75 



21 



18 



6.50 



10 



3 



10.00 



13 



8 



42.25 



44 



41 



109 



10.55 



22.18 



32 



15 



5.40 



22 



1 



11.03 



19 



8 



49.18 



74 



36 



1 Add 2.07 days for complete life cycle. 



