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 

 larva? 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 u at 



at- r— 



;:"r::::::7i :::: 



:; Li 



. J_ 1 A 1 



.jlelL-EL 



-^Jb m JtJzixv. 



o i\i » « m o 



<\i nj (\i qi <\i p) 



MAY 



JUNE 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^. 



Time of pupation. — 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 

 pupa- 

 tion. 



Number 

 of pupse. 



Date of 

 pupa- 

 tion. 



Number 

 of pupse. 



Date of 

 pupa- 

 tion. 



Number 

 of pupae. 



Date of 

 pupa- 

 tion. 



Number 

 of pupse. 



May 20 

 May 25 

 May 26 

 May 28 

 May 29 

 May 30 

 May 31 

 June 1 

 June 2 



1 

 1 

 1 

 1 

 4 

 3 

 3 



June 3 

 June 4 

 June 6 

 June 7 

 June 8 

 June 9 

 June 10 

 June 11 

 June 12 



8 

 3 

 2 

 9 

 4 

 6 

 15 

 16 

 20 



June 13 

 June 14 

 June 15 

 June 16 

 June 17 

 June 18 

 June 20 

 June 21 

 June 22 



18 

 14 

 4 

 4 

 3 

 5 

 2 

 4 

 11 



June 23 

 June 24 

 June 25 

 June 26 

 June 28 

 July 1 

 July 5 

 July 6 



Total. . 



6 

 6 

 10 



1 

 4 

 1 

 1 

 2 



197 



