THE CODLING MOTH IN THE YAKIMA VAULEY. 



23 



Table 18. — Length of the pupal stage of pupae of the spring brood of the codling 

 moth, Yakima, Wash., 1920. 







Pupal period in 



days. 



1 





Pupal period in 



days. 



Date of 

 pupation. 



Num- 

 ber of 

 pupae. 









Date of 

 pupation. 



Num- 

 ber of 

 pup;i\ 









Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Apr. 3 



2 



42.00 



42 



42 



Apr. 30 



4 



33.75 



35 



33 



12 



1 



36.00 



36 



36 



May 1 



2 



34.00 



34 



34 



13 



3 



36.00 



37 



34 



2 



4 



32.50 



34 



32 



14 



1 



36.00 



36 



36 



3 



4 



31.25 



32 



31 



15 



1 



31.00 



31 



31 



4 



5 



31.00 



31 



31 



16 



1 



34.00 



34 



34 



5 







31.00 



31 



31 



17 



2 



32.50 



33 



32 



6 



3 



31.67 



32 



31 



18 



2 



37.00 



37 



37 



7 



1 



34.00 



34 



34 



19 



3 



33.67 



37 



31 



8 



3 



33.33 



35 



32 



20 



6 



33.00 



35 



32 



9 



2 



34. 00 



34 



34 



22 







32.00 



34 



30 



10 



2 



33.50 



34 



33 



23 



/ 



32.86 



35 



32 



12 



1 



32.00 



32 



32 



24 



3 



32.00 



32 



32 



13 



3 



32.33 



34 



31 



25 



11 



31.91 



36 



31 



14 



1 



33.00 



33 



33 



26 



14 



35.57 



3S 



34 



15 



1 



34.00 



34 



34 



27 



15 



35.33 



37 



34 



16 



1 



33.00 



33 



33 



28 



8 



33.25 



37 



27 



17 



3 



32.67 



33 



32 



29 







34.50 



35 



34 













Total number of pupa? 136 



Average length of pupal stage in days 33. 56 



Maximum length of pupal stage in days \ 42 



Minimum length of pupal stage in days .V. 27 



MOTHS OF THE SPRING BROOD. 



Time of emergence. — Moths began emerging May 10, but the cold 

 weather held them back, and the maximum period of emergence did 

 not occur until May 25 to June 5, with a maximum of 115 moths on 

 June 2, which was 12 days later than in 1919. Moths continued 

 emerging until July 2. These records will be found in Figure 13. 



/9 24- 



/<3 /a 



Fig. 13. — Emergence of the spring brood of moths of the codling moth at Yakima, Wash., 1920. 



Oviposition by moths of the spring brood. — Oviposition records were 

 obtained from 824 moths confined in cages of about 25 moths each, 

 and tabulated in Table 19. The averages are cage and not indi- 

 vidual averages. (See p. 68 for some individual averages.) 



