THE CODLING MOTH IN MICHIGAN. 



53 



The females were found to be more numerous than the males, 

 which was also observed in the spring brood of moths. 



Lengl/t <>f life cycle of the first generation. — In Table LIV are brought 

 together the average results from observations for (he separate stages 

 of the first generation. These data show that on an average there 

 elapsed 53.59 days from the time of appearance of eggs of the first 

 brood to the time of appearance of eggs of the second brood. Com- 

 paring these results with those of the complete life-cycle series 

 (Tables LY-LVI), there will be found a difference of results of less 

 than one day. In the life-cycle tests 75 individual insects were 

 under observation from the time of the deposition of the eggs to the 

 time of emergence of the moths that resulted from these eggs. 



Table LIV. Summary of results from experiments on the separate stages of the first 

 generation of the codling moth in 1911. 



Life cycle of first generation. 



Number of days. 



Average. Maximum. Minimum 



Incubation of eggs 



Feeding period of larvae . . . 



Making of cocoons 



Pupal stages 



Time before egg deposition 



Total 



7. 94 

 21.25 



7.2 

 14.0 

 3.2 



53.59 



2'. I 



Table LV. — Life cycle of the first generation of the codling moth, as observed by rearing 



at Douglas, Midi., in 1911. 



1 Bagged fruit; average feeding, 20.9 days. 



2 Pupated in fruit; average feeding, 21.4 days. 



