56 



BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



Table XXXVI. — Length of feeding period of codling-moth larvcc of the first 

 brood, bagged-fruit method, Grand Junction, Colo., 1916. 



Date of 



entering 



fruit. 



Num- 

 ber of 

 indi- 

 vidu- 

 als. 





Length of feeding period in 



specified days. 



17 



18 



19 



20 



21 



22 



23 



24 



25 



20 



27 



28 



29 



June 1 

 2 

 3 

 4 

 5 

 6 



8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 2S 



1 



2 



1 



6 



34 



27 



7 



2 



5 



10 



5 



23 



10 



10 



15 



12 



1 



5 



14 



3 



2 



8 



16 



23 



7 



1 



7 







1 

 1 





































1 





























1 







2 



.... 



7 

 3 



1 



"io" 



"4 

 8 

 5 

 3 

 1 

 1 

 1 

 2 

 2 



"2 



2 



1 



"Y 



3 



1 



2 

 1 



5 

 2 





1 

















1 



2 



4 

 1 



2 





2 













1 



1 











1 



.... 

 1 















2 

 2 



1 



1 















1 

 .... 



.... 

 2 



3 



.... 



1 



1 













1 





10 

 2 

 3 

 3 

 2 



2 

 2 

 1 



7 

 6 

 1 



"2" 



4 

 1 



.... 



2 



1 

 2 









1 

 1 







1 









1 



1 



1 



1 



1 





2 









1 













........ 





2 

 1 



2 

 2 



1 



5 



1 



.... 



3 



5 

 2 















1 



2 

 1 

 1 



1 

 1 



7 

 1 



2 

 1 

































1 

 1 

 2 

 1 



















1 

 3 

 3 

 2 



3 



4 

 2 



1 



















2 



2 







1 



2 























"%' 



1 















4 







1 



































234 



7 



14 



54 



39 



49 



38 



30 



11 



9 



4 



6 



2 



1 



Days. 



Average length of feeding period 21. 10 



Maximum length of feeding period 2b) 



Minimum length of feeding period 17 



Length of the cocooning period. — Table XXXVII gives the data 

 for 761 larvae, on the time which elapsed from the time each larva 

 left the fruit until it pupated. Attention is drawn to the fact that 

 300, or nearly one-half, of these individuals formed their cocoons 

 in 4 days, 195 in 5 days, and 89 in G days. The average cocooning 

 period for all the larvse was 5.53 days, the maximum 30 days, and 

 the minimum 2 days. 



