22 



BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



Table X. — Length of feeding period of larvae of the first brood of the codling 

 moth, bagged-fruit method, Grand Junction, Colo., 1915. 



Date of 



entering 



fruit. 



Num- 

 ber 

 of in- 

 divid- 

 uals. 



Length of feeding period in specified days. 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



32 

 1 



33 



34 



35 



May 31 



Juiie 2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



July 1 



2 



3 



1 

 1 



8 



11 

 6 



14 



15 

 4 



11 

 6 

 4 

 1 

 6 

 8 

 5 

 6 

 8 



11 

 5 

 3 



12 

 1 



10 

 8 

 7 





 11 

 

 8 

 7 

 IS 





































1 





































3 

 2 

 1 

 1 





1 



"l" 



3 



'Y 



1 





























1 



1 



1 



1 





















2 

 9 



7 



2 

 2 

 1 





















1 



2 



.... 



1 

 1 



3 

 2 





























1 



1 



1 

 1 

 1 













1 























J 

















1 



3 

 2 



i" 



1 



1 





1 

















2 









2 

 2 

























"i" 



3 



1 







































































1 

 1 



"2 



1 

 1 



1 





























2 

 2 

 2 



~~2 









1 



1 

























3 

 "5" 























1 









1 

 .... 



1 



2 



1 

 1 



1 











1 





















1 

 1 



"3" 

 2 

 1 

 1 

 1 

 1 

 2 



1 

 1 

 1 



























1 





1 









1 













1 

























1 



4 





1 































1 





1 



2 











































1 







1 







4 

 1 



4 



1 

 1 



2 





























1 



1 









1 

 2 



2 





1 



























1 















1 

 1 

 1 

 1 

 3 

 3 

 2 





2 

 1 

 1 



1 

 2 





























1 

 2 

 1 



2 







1 







i 







1 





1 



"i 



2 



3 



2 

 1 

 1 



















1 

 .... 



2 















------ 









9 







1 



1 





















2 

 3 

 3 



























7 

 1 



1 



1 









2 

















1. . 



















































242 



2 



3 



1 



17 



13 



26 



53 



19 



20 



21 



17 



11 



10 



8 



11 



1 



2 



3 



1 



1 



2 



Daps. 



A v< rage length of feeding period 22. 7 



Maximum length of feeding period 35 



Minimum length of feeding period 15 



Length of the cocooning period. — The cocooning period is herein 

 considered as extending from the time the larva leaves the fruit 

 until it has pupated. The data given in Table XI, therefore, apply 

 only to the transforming larvse of the first brood. By reference to 

 this table it will be seen that the cocooning period was recorded for 

 430 individuals which left the fruit from June 23 to July 26. Of 

 this number, 86 formed their cocoon in 4 days, 85 in 5 days, and 67 

 in 6 days. The average number of days for all individuals was 6.70, 

 maximum 28, and minimum 1. This minimum cocooning period of 

 1 day is the shortest period recorded for any larva throughout this 

 and the following season. The cocoon was of normal size, but was 

 constructed very lightly. 



