12 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



PTJP.33 OF THE FIRST BROOD. 



Time cf pupation. — Transforming larvae of the first brood began 

 pupating July 7, and continued until August 12, the largest number 

 pupating from July 13 to 23, with the maximum July 19. (See 

 Fig. 5.) 



Fig. 5. — Pupation of the first brood of the codling moth at Yakima, Wash., 1919. 



Length of pupal stage. — Data on the length of the pupal stage of 

 the first brood of pupae were secured from 128 individuals, as in- 

 dicated in Table 9. 



Table 9. — Length of the -pupal stage of pupae of the first brood of the codling moth, 



Yakima, Wash., 1919. 



Date of 

 pupation. 



Num- 

 ber of 

 pupae. 



Pupal period in days. 



Date of 

 pupation. 



Num- 

 ber of 

 pupa?. 



Pupal period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



July 7 

 8 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 



1 



2 

 4 

 7 

 5 



11 

 9 

 G 



12 



13 

 9 



11 

 8 



12.00 

 11.50 

 11.00 

 12.43 

 12.60 

 12.55 

 12.22 

 12.11 

 13.42 

 17.31 

 12.89 

 16.27 

 17.75 



12 

 12 

 12 

 14 

 13 

 15 

 13 

 13 

 21 

 44 

 15 

 44 

 37 



12 

 11 

 10 

 10 

 11 

 11 

 11 

 11 

 12 

 11 

 10 

 10 

 13 



July 23 



24 



25 



26 



28 



29 



30 



Aug-. 3 



4 



5 



6 



7 



11 



6 

 1 

 3 



2 



14.00 

 13.00 

 13.33 

 15.00 

 14.00 

 15.33 

 13.00 

 14.00 

 13. .SO 

 13.25 

 15.00 

 12.00 

 13.00 



17 

 13 

 14 

 15 

 14 

 16 

 13 

 14 

 14 

 14 

 15 

 12 

 14 



9 



13 

 12 

 15 

 14 

 15 

 13 

 14 

 13 

 13 

 15 

 12 

 12 



Total number of pupje 128 



Average length of the pupal stage in days 13. 91 



Maximum length of the pupal stage in days 44 



Minimum length of the pupal 6tage in days 9 





