THE CODLING MOTH IN THE YAKIMA VALLEY. 



Material for the seasonal-history studies of 1919 was obtained from 

 banded apple trees in the vicinity of Yakima. The larvae were col- 

 lected early in March, before the exit tubes had been constructed, and 

 were allowed to spin new cocoons in the cocooning racks. 



PUP.E OF THE SPRING BROOD. 



Time of 'pupation. — Daily examinations of the cocooning racks were 

 made and the first pupa was found on March 30. No more pupated 

 until April 8, and the last wintering larva pupated on May 30. The 



22 



27 



7 ' ' 12 /7 22 27 2 ' 7 



Fig. 1.— Pupation of the spring brood of the codling moth at Yakima, Wash., 1919. 



period of greatest pupation extended from April 15 to April 30, with 

 a maximum April 27. The time of pupation of 201 individuals is 

 illustrated in Figure 1. 



Length of the pupal stage. — Table 2 gives the length of the pupal 

 stage of 180 pupae of the spring brood. 



Table 2. — Length of the pupal stage of pupae of the spring brood of the codling 

 moth, Yakima, Wash., 1919. 







Pupal period in 



days. 







Pupal period in 



days. 



Date of 

 pupation. 



Num- 

 ber of 

 pupae. 









Date of 

 pupation. 



Num- 

 ber of 

 pupae. 









Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 







age. 



mum. 



mum. 







age. 



mum. 



mum. 



Mar. 30.... 



1 



44.00 



44 



44 



Apr. 29. . . . 



6 



31.67 



34 



29 



Apr. 8.... 



2 



39.50 



40 



39 



30.... 







32.60 



34 



31 



9.... 



3 



40.00 



41 



39 



May 1.... 



1 



32.00 



32 



32 



12.... 



1 



38.00 



38 



38 



2.... 



1 



32.00 



32 



32 



13.... 



3 



37.00 



37 



37 



3.... 



1 



32.00 



32 



32 



15.... 



8 



35.25 



36 



34 



5.... 



1 



29.00 



29 



29 



16.... 



4 



35. 25 



36 



35 



6.... 



2 



29.00 



30 



28 



17.... 



4 



34.00 



34 



34 



7.... 



3 



29.33 



30 



29 



18.... 



3 



33.00 



33 



33 



9.... 



2 



27.00 



27 



27 



19.... 



7 



32.57 



33 



32 



10.... 



1 



28.00 



28 



28 



20.... 



4 



31.25 



32 



31 



11.... 



2 



26.50 



28 



25 



21.... 



4 



32.25 



34 



31 



12.... 



1 



30.00 



30 



30 



22.... 



6 



31.00 



32 



30 



14.... 



3 



29.33 



30 



29 



23.... 



20 



31.05 



33 



29 



17.... 



2 



29.50 



33 



26 



24.... 



8 



31.13 



32 



29 



18.... 



1 



31.00 



31 



31 



25.... 



13 



29.92 



31 



26 



20.... 



1 



27.00 



27 



27 



26.... 



18 



30.28 



31 



29 



21.... 



1 



28.00 



28 



28 



27.... 



22 



31.23 



35 



29 



30.... 



1 



27.00 



27 



27 



28.... 



14 



31.14 



34 



29 













Total number of pupae 180 



Average length of pupal period in days 31. 63 



Maximum length of pupal period in days , 44 



Minimum length of pupal period in days 25 



