THE CODLING MOTH IN THE YAKIMA VALLEY. 



29 



PUP.E OF THE FIRST BROOD. 



Time of pupation. — The first pupa occurred July 10, and larvae 

 continued to pupate until August 15, with a maximum on July 17, as 

 shown in Figure 16. 



Length of pupal stage. — -The average length of the pupal stage of 219 

 pupae was 12.37 days, as shown in Table 25. 



Table 25. — Length of the pupal stage of pupx of the first brood of the codling moth, 



Yakima, Wash., 1920. 







Pupal period in days. 







Pupal period in 



davs. 



Date of 

 pupation. 



Num- 

 ber of 

 pupae. 









Date of 

 pupation. 



Num- 

 ber of 

 pupae. 









Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



13 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



July 10 



! 



13.00 



13 



Julv 27 



11 



11.82 



13 



11 



* 11 



2 



14.00 



14 



14 



28 



10 



12.20 



13 



11 



12 



2 



12.50 



13 



12 



29 



3 



12.00 



13 



11 



13 



2 



13.00 



13 



13 



30 



7 



12.71 



16 



12 



14 



3 



12.00 



12 



12 



31 



3 



11.00 



11 



11 



15 



11 



12.45 



14 



12 



Aug. 1 



7 



10.86 



13 





16 



11 



12.82 



14 



11 



2 



4 



11.50 



12 



11 



17 



25 



12.56 



14 



11 



3 



7 



11.57 



12 



11 



18 



12 



12.17 



14 



11 



4 



4 



12.00 



12 



12 



19 



3 



12.67 



14 



12 



5 



4 



11.75 



14 



11 



20 



11 



13. IS 



14 



11 



6 



4 



13. 75 



14 



13 



21 



10 



12.70 



13 



11 



7 



1 



12.00 



12 



12 



22 



6 



12.00 



13 



11 



8 



1 



15.00 



15 



15 



23 



17 



11.82 



13 



10 



9 



1 



13.00 



13 



13 



24 



6 



11.83 



13 



11 



10 



1 



14.00 



14 



14 



25 



14 



12. 21 



14 



11 



12 



2 



17.50 



19 



16 



26 



11 



11.82 



13 



11 



14 



2 



18.50 



20 



17 



Total number of pupae 219 



Average length of the pupal stage in days 12. 37 



Maximum length of the pupal stage in days 20 



Minimum length of the pupal stage in days 7 



MOTHS OF THE FIRST BROOD. 



Time of emergence. — Moths began emerging July 23 and con- 

 tinued until September 30, the maximum occurring on August 15, 

 although the maximum period of emergence extended from July 27 

 to August 24. (See fig. 17.) This is about 10 days later than the 

 maximum period for 1919. 



Fig. 17.— Emergence of the first brood'of moths of the codling moth at Yakima, Wash., 1920 



Oviposition by moths of the first brood. — A total of 1,076 moths was 

 used in obtaining oviposition records, the first of these emerging 

 July 27. Many of these moths began ovipositing the day following 

 emergence. The interval before maximum oviposition was 67.0 

 days. This is shown in Table 26, the averages being for cages and 

 not individuals. 



