THE CODLING MOTH IN THE YAKIMA VALLEY, 



23 



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

 moth, Yakima, Wash., 1920. 



Date of 

 pupation. 



Num- 

 ber of 

 pupae. 



Pupal period in days. 



Date of 

 pupation. 



Num- 

 ber of 

 pupee. 



Pupal period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Apr. 3 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 



2 

 1 



1 

 1 

 1 

 2 

 2 

 3 

 6 

 5 

 7 

 3 

 11 

 14 

 15 

 8 

 6 





42.00 

 36.00 

 36.00 

 36.00 

 31.00 

 34.00 

 32.50 

 37.00 

 33.67 

 33.00 

 32.00 

 32.86 

 32.00 

 31.91 

 35.57 

 35.33 

 33. 25 

 34.50 



42 

 36 

 37 

 36 

 31 

 34 

 33 

 37 

 37 

 35 

 34 

 35 

 32 

 36 

 38 

 37 

 37 

 35 



42 

 36 

 34 

 36 

 31 

 34 

 32 

 37 

 31 

 32 

 30 

 32 

 32 

 31 

 34 

 34 

 27 

 34 



Apr. 30 

 May 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 12 

 13 

 14 

 15 

 16 

 17 



4 

 2 

 4 

 4 

 5 

 5 

 3 

 1 

 3 

 2 

 2 

 1 

 3 

 1 

 1 

 1 

 3 



33.75 

 34.00 

 32.50 

 31.25 

 31.00 

 31.00 

 31.67 

 34.00 

 33.33 

 34.00 

 33.50 

 32. CO 

 32.33 

 33.00 

 34.00 

 33.00 

 32.67 



35 

 34 

 34 

 32 

 31 

 31 

 32 

 34 

 35 

 34 

 34 

 32 

 34 

 33 

 34 

 33 

 33 



33 

 34 

 32 

 31 

 31 

 31 

 31 

 34 

 32 

 34 

 33 

 32 

 31 

 33 

 34 

 33 

 32 



Total number of pupse 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 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. 



/3 /8 



28 <3 



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



Oviposition hy 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.) 



