THE CODLING MOTH IN THE YAKIMA VALLEY. 



45 



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



Yakima, Wash., 1921. 







Feeding period in days. 







Feedin 



g 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 larva? 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 larvse 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 larva? are given 

 in Table 38 



Table 38. 



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

 first brood, Yakima, Wash., 1921. 







Cocooning period 



in days. 







Cocooning period in days. 



Larvse 

 left fruit. 



Num- 

 ber of 

 larvse. 









Larvse 

 left fruit. 



Num- 

 ber of 

 larvse. 









Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



June 27 



2 



8.00 



8 



8 



July 15 



49 



6.37 



15 



2 



29 



1 



7.00 



7 



7 



16 



55 



6.76 



21 



3 



30 



3 



6.00 



6 



6 



17 



43 



7.40 



23 



2 



July 2 



4 



6.00 



10 



4 



18 



38 



5.50 



13 



4 



3 



6 



8.00 



10 



5 



19 



22 



6.77 



24 



2 



4 



6 



5.50 



6 



5 



20 



17 



5.41 



12 



3 



5 



3 



6.00 



7 



5 



21 



16 



4.94 



11 



1 



6 



2 



5.50 



6 



5 



22 



21 



5.00 



16 



2 



7 



12 



5.17 



11 



4 



23 



11 



6.18 



19 



2 



8 



8 



5.00 



10 



4 



24 



7 



8.29 



28 



4 



9 



15 



4.53 



7 



4 



25 



3 



9.67 



21 



3 



10 



19 



5.37 



16 



3 



26 



3 



4.33 



5 



4 



11 



28 



6.36 



20 



3 



27 



2 



3.50 



4 



3 



12 



40 



5.50 



14 



4 



28 



2 



14.00 



24 



4 



13 



43 



6.16 



16 



3 



29 



2 



15.50 



23 



8 



14 



56 



5.71 



14 



3 



30 



1 



6.00 



6 



6 



Total number of larvse 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 



