CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 



73 



Unless reared, the larvae of the two broods can not be separated and 

 are simply referred to as overwintering larvae. Similarly the resulting 

 pupae and moths in the spring originate from the two separate broods 

 of the previous year's larvae, and these are spoken of as " spring-brood 

 pupae" and " spring-brood moths." 



SPRING BROOD OF PUP^. 



Time of pupation. — In the rearing cages the first observed pupation 

 took place May 24. Considering, however, the time of the earliest 

 record for the emergence of moths, and the duration of the pupal 

 stage, which at that time of the season lasted 24 days, it is probable 

 that pupation must have begun as early as May 20. The last larvae 

 of the wintering broods pupated June 25. The pupation period thus 

 covered a length of time of over one month (fig. 22). Since the last 

 moth of the spring brood emerged July 17, pupae were in evidence 

 from May 20 to July 17. 



Length of spring pupal stage. — In cage experiments, records were 

 obtained of the duration of the pupal stage for 50 individuals. (See 

 Table I.) 



Table I —Length of pupal periods in spring brood from wintering larvae, collected 

 during 1908, on banded trees. 



No. 



Date of— 



Days. 



No. 



Date of— 



Days. 













Pupa- 



Emer- 







Pupa- 



Emer- 







tion. 



gence. 







tion. 



gence. 





1 



May 24 



June 17 



24 



28 



May 29 



June 21 



23 



2 



May 25 



June 16 



22 



29 



May 30 



June 22 



23 



3 



...do 



June 19 



25 



30 



...do 



June 17 



18 



4 



...do 



June 28 



34 



31 



May 31 



June 22 



22 



5 



May 26 



June 17 



22 



32 



...do 



...do 



22 



6 



...do 



June 20 



25 



33 



...do 



...do 



22 



7 



May 27 



...do 



24 



34 



...do 



June 21 



21 



8 



...do 



...do 



24 



35 



...do 



...do 



21 



9 



...do 



...do 



24 



36 



June 1 



June 23 



22 



10 



...do 



June 27 



31 



37 



...do 



...do 



22 



11 



...do 



June 20 



24 



38 



...do 



...do 



22 



12 



...do 



...do 



24 



39 



...do 



...do 



22 



13 



...do 



...do 



24 



40 



June 2 



...do 



21 



14 



...do 



June 14 



18 



41 



...do 



...do 



21 



15 



...do 



June 20 



24 



42 



...do 



...do 



21 



16 



...do 



...do 



24 



43 



...do 



...do 



21 



17 



...do 



...do 



24 



' 44 



June 17 



July 2 



15 



18 



...do 



June 14 



18 



45 



...do 



July 3 



16 



19 



May 28 



June 19 



22 



46 



...do 



July 4 



17 



20 



...do 



June 20 



23 



47 



June 18 



...do 



16 



21 

 22 



...do 



...do 



...do 



June 21 



23 

 24 



48 

 49 



June 20 

 ...do 











23 



...do 



June 20 



23 



50 



...do 







24 



...do 



June 16 



19 



51 



June 21 



"July "6" 



"*15" 



25 



...do 



June 21 



24 



52 



June 23 



July 8 



15 



26 



May 29 



...do 



23 



53 



June 25 







27 



...do 



Total 



...do 



23 









438 



639 









1,077 





