LIFE HISTORY OF THE CODLING MOTH IN MAINE. 



29 



WINTER-KILLED LARVAE. 



Owing to the low temperatures during the winter of 1913-14 a 

 high mortality of the codling-moth larvae occurred. The number of 

 larvse from the banded trees killed by the winter temperatures is 

 estimated at 81.52 per cent. The number of winter-killed larvae 

 which had been reared under laboratory conditions was 86.61 per 

 cent. The United States Weather Bureau, Climatological Report 

 for the New England section, January, 1914, makes special mention 

 of the cold wave on January 13 and 14. This report states that "at 



24 



:;:::::::::::7l :::: 



;: z_\ 



_jj_ _l Aji 



- A LY La.' L-r 



^ji\i : t _il,,a_ 



*» (\j Q| l\| <\J (Vj P) " x> v^^^<Vl(\j(V|<\J(U 



A7/9 Y JUN£ JULY 



Fig. 5. — Diagram showing pupation of the spring brood of the codling moth in 1914 at Winthrop, Me. 



(Original.) 



many stations of long record all previous minimum temperatures 

 were exceeded on these dates." 



SPRING BROOD OF PUP^E. 



Time of pujyation. — The first of the spring-brood larvae pupated 

 May 20, the last July 6. (See fig. 5.) Maximum pupation occurred 

 on June 12, when 20 larvae pupated. In the preceding year the 

 maximum pupation took place on June 6. (See Table XXIII for 

 the time of pupation.) 



Table XXIII. — Time of pupation of overwintering larvae, Winthrop, 



Me., 1914. 





Date of 



Number 



Date of 



N'uinber 



1 >:.(«■ (if 



Number 



Date of 



Number 



pupa- 

 tion. 



III pllpil!. 



pupa- 

 tion. 



ol pupii 



pupa- 

 tion. 



of pupae. 



tion. 



of pupil'. 



May 20 



1 



Tune 3 



8 



June 13 



18 



June 23 



6 



May 25 



1 



June 4 



3 



June 14 



11 



June 21 



6 



May 2d 



1 



June 6 



2 



Tune 15 



4 



June 2. r > 



10 



May 28 



1 



June 7 







June Hi 



4 



Juno 20 



1 



May 20 



4 



Tune 8 



4 



June 17 



3 



Juno 28 



4 



May 80 



3 



June: 



(1 



June 18 



5 



July 1 



1 



May 31 



3 



Tune 10 



16 



Juno 20 



2 



July 6 



1 



f i J r i « - 1 



1 



Tune 1 1 



in 



June '.'1 



4 



July 



2 



June 2 



3 



Tune 12 



20 



June, 22 



11 





















Total. . 



197 



