46 



BULLETIN 252, TJ. S. DEPARTMENT OF AGRICULTURE. 



Table XL — Lenqth of feeding period of second-brood larvas, stock-jar method, Winthrop, 



Me., 1914. 



Number 

 of larvae. 



Date of 

 hatching. 



Date of 



leaving 



fruit. 



Sex. 



Days of 

 feeding. 



1 

 1 



1 

 1 



Sept. 8 



...do 



...do 



do 



Oct. 16 

 Oct. 21 

 ...do 



Oct. 25 



9 



38 

 43 

 43 



47 









42.75 







BAND-RECORD EXPERIMENT, 1914. 



During the season of 1914 a total of 499 larvae was collected from 

 banded trees. The first larvas left the fruit August 3, the last October 

 11. None of these larvae transformed. (See Table XLI.) 



Table XLI. — Band-record experiment, Winthrop, Me., 1914. 



Number 

 of record. 



Date of 

 collect- 

 ing. 



Number 

 of larvae. 



Number 



of moths, 



1914. 



Number 

 of para- 

 sites, 

 1914. 



No. of 

 record. 



Date of 

 collect- 

 ing. 



Number 

 of larvae. 



Number 



of moths, 



1914. 



Number 

 of para- 

 sites, 

 1914. 



1 

 2 

 3 



4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 



Aug. 3 

 Aug. 6 

 Aug. 9 

 Aug. 12 

 Aug. 15 

 Aug. 18 

 Aug. 21 

 Aug. 24 

 Aug. 27 

 Aug. 30 

 Sept. 2 

 Sept. 5 

 Sept. 8 



1 

 3 

 



7 

 1 

 2 

 15 

 8 

 17 

 23 

 30 

 82 

 80 





 

 

 

 

 

 

 

 

 

 

 

 



• 

 

 

 

 

 

 

 

 

 

 

 

 



14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 



Sept. 11 

 Sept. 14 

 Sept. 17 

 Sept. 20 

 Sept. 23 

 Sept. 26 

 Sept. 29 

 Oct. 2 

 Oct. 5 

 Oct. 8 

 Oct. 11 



20 



31 



43 



42 



54 



16 







6 



11 



2 



5 





 

 

 

 

 

 

 

 

 

 





 

 

 

 

 

 

 

 

 

 



499 











COMPARISON OF THE LIFE HISTORY OF THE CODLING 

 MOTH IN 1913 AND 1914. 



A comparison of the life history of the codling moth is shown dia- 

 grammatically in figure 9. This chart shows the beginning and end- 

 ing of the different stages of the insect, and, in a general way, the 

 maximum of activity for each phase of the life history. It will be 

 noted that the life histories of the species during 1913 and 1914 

 corresponded quite closely. Variations were due chiefly to climatic 

 differences which were of comparatively short duration. 



In 1913 pupation began somewhat earlier than in 1914. An 

 unusually warm period during the latter part of April and again 

 during the first few days of May, 1913, doubtless exerted some in- 

 fluence on the larvae. The very early pupae in 1913, however, were 

 evidently somewhat abnormal and failed to transform to moths. 

 Pupation during both seasons ceased at approximately the same 

 time. The average pupation period of the spring-brood pupae in 

 1913 was 19.030 days; in 1914, 22.581 days. 



