46 



BULLETIN 1236, U. S. DEPARTMENT OF AGRlCtfLTXJRE. 



PUP.E OF THE FIRST BROOD. 



Time of 'pupation. — Pupation by larvae of the first brood was first 

 observed on July 5 and continued daily, with four exceptions, until 

 August 15. This is shown in Figure 27, which also gives the date of 

 maximum pupation as July 23, when 52 larvaa transformed. 



c52 



Fig. 27.— Pupation of the first brood of the codling moth at Yakima, Wash., 1921. 



Length of pupal stage. — Table 39 shows the length of the pupal 

 stage of 491 pupae. 



Table 39. — Length of the pupal stage of pupae of the first brood of the codling moth, 



Yakima, Wash., 1921. 



Date of 

 pupation. 



Number 



of 

 pupae. 



Pupal period in days. 



Date of 

 pupation. 



Number 



of 

 pupae. 



Pupal period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



July 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 



2 

 5 

 2 

 1 

 3 

 3 

 6 

 17 

 14 

 10 

 13 

 26 

 32 

 24 

 43 

 28 

 30 

 45 

 49 



11.00 

 12.80 

 14.50 

 11.00 

 13.00 

 13.00 

 12.67 

 13.18 

 12.14 

 12.70 

 12.62 

 13.62 

 13.00 

 12.75 

 12.77 

 12.21 

 12.20 

 11.89 

 12.78 



11 

 14 

 15 

 11 

 14 

 13 

 17 

 16 

 14 

 14 

 18 

 27 

 20 

 20 

 27 

 14 

 13 

 15 

 26 



11 

 12 

 14 

 11 

 12 

 13 

 11 

 11 

 11 

 12 

 11 

 10 

 11 

 9 

 6 

 11 

 11 

 6 

 10 



July 24 



25 



26 



27 



28 



29 



30 



31 



Aug. 1 



2 



3 



5 



6 



7 



8 



9 



12 



21 



33 

 16 

 18 

 22 

 9 

 8 

 6 

 6 

 4 

 2 

 5 

 1 

 1 

 1 

 1 

 1 

 1 

 3 



12.36 

 11.88 

 12.89 

 12.32 

 11. 89 

 12.50 

 11.67 

 11.83 

 12.50 

 11.50 

 12.20 

 11.00 

 14.00 

 13.00 

 17 00 

 12.00 

 16.00 

 23.00 



14 

 14 

 25 

 13 

 14 

 14 

 13 

 13 

 14 

 12 

 16 

 11 

 14 

 13 

 17 

 12 

 16 

 24 



10 

 10 

 11 

 10 

 10 

 11 

 9 

 10 

 12 

 11 

 10 

 11 

 14 

 13 

 17 

 12 

 16 

 22 



Total number of pupae 4 91 



Average length of pupal stage in days S 



Maximum length of pupal stage in days 27 



Minimum length of pupal stage in days 6 



