THE CODLING MOTH IN THE YAKIMA VALLEY 



45 



Table 37. — Length of feeding period of larvae of the first brood of the codling moth, 



Yakima, Wash., 1921. 







Feeding period in days. 







Feeding period in days. 



Date of 

 entering 



Num- 

 ber of 









Date of 

 entering 



Num- 

 ber of 





















fruit. 



larvae. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



fruit. 



larva-. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



June 2 



2 



31.00 



34 



28 



June 22 



71 



23.99 



29 



13 



3 



3 



27.33 



31 



24 



23 



74 



24.54 



33 



20 



4 



6 



28.67 



31 



25 



24 



24 



24.54 



32 



20 



5 



4 



27.75 



30 



25 



25 



46 



24.48 



37 



18 



8 



12 



34.33 



44 



26 



26 



18 



24.78 



30 



19 



9 



24 



31.38 



38 



18 



27 



27 



24.89 



32 



22 



10 



19 



32.53 



36 



30 



28 



15 



21.80 



24 



19 



11 



28 



30.25 



44 



22 



29 



6 



21.33 



27 



15 



12 



13 



28.77 



38 



24 



30 



4 



22.50 



24 



22 



13 



24 



28.08 



32 



24 



July 1 



9 



22.11 



33 



13 



14 



39 



26. 97 



39 



19 



2 



7 



22.14 



25 



20 



15 



31 



30.32 



42 



25 



4 



6 



22.17 



26 



19 



17 



10 



27.20 



36 



22 



5 



1 



18.00 



18 



18 



18 



24 



27.46 



34 



24 



6 



2 



21.50 



22 



21 



19 



36 



25.89 



33 



21 



7 



4 



21.75 



25 



20 



20 



54 



24.46 



33 



20 



8 



1 



17.00 



17 



17 



21 



78 



23. 35 



29 



12 













Tota 1 number of larvae 722 



Average length of feeding period in days 25. 83 



Maximum length of feeding period in days 44 



Minimum length of feeding period in days 12 



Length of the cocooning period. — The average number of days 

 which 540 larvae of the first brood required to build their cocoons 

 was 6.12. The date of leaving the fruit and the average, maximum, 

 and minimum length of the cocooning period of these larvae are given 

 in Table 38 



Table 38. 



-Length of cocooning period of transforming codling moth larvx of the 

 first brood, Yakima, Wash., 1921. 



Larvae, 

 left fruit. 



Num- 

 ber of 

 larvae. 



Cocooning period in days. 



Larvae 

 left fruit. 



Num- 

 ber of 

 larvae. 



Cocooning period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



June 27 

 29 

 30 

 July 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 



2 

 1 

 3 

 4 

 6 

 6 

 3 

 2 

 12 

 8 

 15 

 19 

 28 

 40 

 43 

 56 



8.00 



7.00 

 6.00 

 6.00 

 8.00 

 5.50 

 6.00 

 5.50 

 5.17 

 5.00 

 4.53 

 5.37 

 6.36 

 5.50 

 6.16 

 5.71 



8 

 7 

 6 

 10 

 10 

 6 

 7 

 6 

 11 

 10 

 7 

 16 

 20 

 14 

 16 

 14 



S 

 7 

 6 

 4 

 5 

 5 

 5 

 5 

 4 

 4 

 4 

 3 

 3 

 4 

 3 

 3 



Julv 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 



49 



55 



43 



38 



22 



17 



16 



21 



11 



7 



3 



3 



2 



2 



2 



1 



6.37 

 6.76 

 7.40 

 5.50 

 6.77 

 5.41 

 4.94 

 5.00 

 6.18 

 8.29 

 9.67 

 4.33 

 3.50 

 14.00 

 15.50 

 6.00 



15 

 21 

 23 

 13 

 24 

 12 

 11 

 16 

 19 

 28 

 21 

 5 

 4 

 24 

 23 

 6 



2 

 3 

 2 

 4 

 2 

 3 

 1 

 2 

 2 

 4 

 3 

 4 

 3 

 4 

 8 

 6 



Total number of larva? 540 



Average length of cocooning period in days 6. 12 



Maximum length of cocooning period in days 28 



Minimum length of cocooning period in days 1 



