LIFE HISTORY OF THE CODLING MOTH IE" MAINE. 5 



the tiixie of pupation of 753 overwintering larvae. It will be noted 

 that the first larva pupated May 5, while the last larva under observa- 

 tion did not pupate until July 7. Hence spring-brood pupation 

 extended over a period of about two months. The maximum 



75 



7 

 65 

 60 

 55 

 50 

 45 

 40 

 35 

 30 

 25 



a o 



15 



/O 



5 



It 



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/Y7AY JUNE. UULY 



Fig. 1.— Diagram showing pupation of the spring brood of the codling moth in 1913 at Winthrop, Me. 



(Original.) 



time of pupation was June 6, when 72 larvae transformed, 

 greater part of the larvae pupated during the first half of June. 

 fig. 1.) 



Table I. — Time of pupation of overwintering larvse, Winthrop, Me., 1913. 



The 

 (See 



Date of 

 pupa- 

 tion. 



Number 

 of pupae. 



Date of 

 pupa- 

 tion. 



Number 

 of pupae. 



Date of 

 pupa- 

 tion. 



Number 

 of pupae. 



Date of 

 pupa- 

 tion. 



Number 

 of pupae. 



May 5 

 May 6 

 May 10 

 May 14 

 May 17 

 May 18 

 May 23 

 May 24 

 May 25 

 May 26 

 May 28 

 May 29 

 May 30 



1 

 1 

 1 



2 

 1 

 1 

 3 

 2 

 2 

 3 

 4 

 3 



6 



1 



May 31 

 June 1 



June 2 

 June 3 

 June 4 

 June 5 

 June 6 

 June 7 

 June 8 

 June 9 

 June 10 

 June 11 

 June 12 



10 

 29 

 21 



38 

 58 

 63 

 72 

 56 

 17 

 12 

 44 

 39 

 38 



June 13 

 June 14 

 June 15 

 June 16 

 June 17 

 June 18 

 June 19 

 June 20 

 June 21 

 June 22 

 June 23 

 June 24 

 June 25 



22 



28 



28 



20 



15 



20 



12 



11 



11 



9 



6 



7 



3 



June 26 

 June 27 

 June 28 

 June 29 

 June 30 

 July 1 

 July 2 

 July 3 

 July 7 



Total . . 



4 

 10 

 5 

 4 

 3 

 5 

 1 

 1 

 1 



753 



Length of the pupal stage. — The average length of the pupal stage 

 of 483 individuals, as recorded in Table II, was found to be 19.03 

 days; maximum, 44 days; minimum, 9 days. By reference to this 

 table it will be seen that as the season advanced the length of the 

 pupal stage was gradually shortened, due to higher average daily 

 temperatures. 



