CODLING MOTH IN NORTHWESTEKN PENNSYLVANIA. 



109 



The development of the insect in 1909 was about intermediate as 

 compared with the results of the previous years. The early fall was 

 quite variable, changing frequently from warm to extremely cold/ 

 resulting in a sudden stop in the transformation of late larvae of the 

 first brood; the oviposition period for the second brood became 

 limited and also late deposited eggs failed to hatch. A number of 

 larvse of the second brood spun up before they became full grown and 

 several did not reach hibernating places before freezing temperature 

 set in. Of the insects developed during 1909 83.87 per cent were of 

 the first generation and 16.13 per cent of the second generation. Of 

 the first-brood larvse 23.46 per cent transformed, while 76.54 per cent 



Fig. 32.— Time of leaving the fruit of the first-brood and second-brood larvae of the codling moth, during 

 1907, 1908, and 1909, at North East, Pa. (Original.) 



wintered. A summary of the results of life-history studies for these 

 three years is given in Table XLI. (See also figs. 31 and 32.) 



Table XLI. — Summary of results of band records for 1907, 1908, and 1909, showing the 

 comparative size of broods and relative number of transforming and wintering larvae. 



Larvae from band collections. 



Percentages for— 



1907. 



1908. 



1909. 



Transforming larvae of total band collection 



2.5 

 97.5* 

 96.5 



3.5 



3 

 97 



35.9 



64.1 



50 



50 



67.7 



32.3 



18.74 

 81.26 

 83.87 

 16.13 

 23.46 

 76.54 



Wintering larvae of total band collection 



Relative proportion of first-brood larvae 



Relative proportion of second-brood larvse 



Transforming larvae of first brood 



Wintering larvae of first brood 





