THE CODLING MOTH IN THE YAKIMA VALLEY. 



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Fig. 15.— Hatching of larvae of the first brood of the codling moth at Yakima, Wash., 1920. 



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Table 22. — Length of feeding period of larvae of the first 



brood of the codling moth, 







stock-jar method, Yakima, Wash., 1920. 









Feeding period in days. 







Feeding period in days. 



Date of 



entering 



Num- 

 ber of 





Date of 

 entering 



Num- 

 ber of 

















fruit. 



larvse. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



fruit. 



larvas. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



June 18 



2 



20.00 



20 



20 



July 3 



22 



20.41 



30 



10 



19 



1 



17. CO 



17 



17 



4 



18 



18.11 



22 



11 



20 



14 



20.29 



30 



17 



5 



16 



19.06 



26 



13 



21 



10 



20.20 



24 



17 



6 



11 



19.73 



31 



12 



22 



7 



19.71 



24 



17 



7 



7 



17.71 



20 



16 



23 



6 



18.83 



23 



16 



8 



6 



21.50 



25 



19 



24 



8 



17.50 



20 



15 



9 



12 



21.33 



26 



17 



25 



4 



16.00 



17 



15 



10 



14 



20.36 



23 



18 



26 



15 



18.60 



24 



15 



11 



6 



17.83 



21 



14 



27 



13 



17.54 



22 



13 



12 



2 



16.50 



17 



16 



28 



7 



18.29 



20 



16 



13 



1 



21.00 



21 



21 



29 



18 



17.72 



23 



14 



14 



7 



21.29 



33 



17 



30 



12 



16.83 



20 



14 



15 



3 



20.67 



27 



17 



July 1 



12 



16.83 



19 



15 



16 



2 



16.00 



16 



16 



2 



10 



21.30 



29 



16 



17 



2 



21.00 



22 



20 



Total number of larvas 268 



Average length of feeding period in days 19. 05 



Maximum length of feeding period in days 33 



Minimum length of feeding period in days 10 



Length of feeding period, bagged-fruit method. — Where the bagged- 

 fruit method of feeding was used, the average period was 20.28 

 days. (See Table 23.) 



