32 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Life cycle, bagged-fruit feeding method. — The life cycle of 43 indi- 

 viduals fed by the bagged-fruit method is given in Table 29. Here 

 the incubation period averaged 9.79 days, the larval feeding period 

 19.58 days, the cocooning period 5.18 days, the pupal period 12.02 

 days, and the life cycle 46.57 days, or, adding 2.93 days for the 

 interval between emergence of the moth and egg deposition, 49.50 

 days for the complete life cycle. 



Table 29. — Life cycle of the first generation of the codling moth as observed by 

 rearing, bagged-fruit feeding method, Yakima, Wash., 1920. 





Num- 





Larval feeding 



Cocooning period. 



Pupal period. 



Life cycle. 1 



Date of 



ber of 



Incu- 



















egg depo- 



indi- 



ba- 











































sition. 



vid- 

 uals. 



tion. 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 







age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 







Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



June 13 



4 



11 



20.00 



21 



18 



8.75 



15 



5 



12.25 



13 



11 



52.00 



60 



47 



15 



5 



11 



19.00 



23 



16 



5.00 



6 



4 



12.00 



14 



11 



47.00 



52 



43 



16 



3 



11 



20.00 



26 



15 



5.00 



5 



5 



13.00 



• 13 



13 



49.00 



55 



44 



18 



3 



10 



18.33 



19 



17 



3.66 



4 



3 



12.00 



13 



11 



43.99 



46 



42 



19 



7 



10 



18.57 



22 



14 



5.14 



9 



4 



12.00 



14 



11 



45.71 



49 



39 



20 



3 



10 



16.33 



17 



15 



3.33 



4 



3 



12.00 



13 



11 



41.66 



43 



41 



21 



11 



10 



20.55 



26 



17 



5.45 



8 



5 



11.64 



13 



11 



47.64 



53 



43 



25 



3 



7 



19.33 



21 



18 



5.00 



5 



5 



12.33 



13 



12 



43.66 



46 



42 



26 



4 



7 



22.25 



24 



20 



4.00 



4 



4 



12.00 



13 



11 



45.25 



47 



42 



43 



9.79 



19.58 



26 



14 



5.18 



15 



3 



12.02 



14 



11 



46.57 



60 



39 



1 Add 2.93 days for complete life cycle. 



<ee»7t 





|Fig. 18.— Time of deposition of eggs of the second brood of the codling moth at Yakima, Wash., 1920. 



