•HE CODLTXG MOTH IX MICHIGAN 



53 



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

 which was slso observed in the spring brood of moths. 



Length of lift cycle of the first generation. — In Table LIY are brought 

 together the average results from observations for the 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 LV-LYI), 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 LIY. — 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. 



Ayerage. 



Maximum. 



Minirnurn. 



Incubation of esss 



7.94 

 21.25 



7.2 

 14.0 



3.2 



10 

 29 



18 



21 



9 



4 





15 





3 





6 





1 







Total 



53. 59 



87 



29 







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

 at Douglas, Mich., in 1911. 



Xo. 

 ofor> 

 serya- 



tion. 



Date of— 





Days for- 







E ™ '■ TTatph- Larya 



deposi- i l ™ n leaying 



tion. | mg " the fruit. 



Pupa- 

 tion. 



Emer- 

 gence of 

 mo tli. 



Hatch- 

 ing. 



Feed- 

 ing. 



Making 



of 

 cocoon. 



Pupal 

 period. 



Total 



life 

 cycle. 



1 



2 



3 



4 



5 



6 



17 



18 



19 



110 



ill 



112 



113 



U4 



115 



116 



117 



118 



119 



120 



21 



22 



23 



24 



25 



June 1 



...do 



...do 



June 3 



June 5 

 ...do 



June 6 



...do 



...do 



...do 



...do 



...do 



...do 



...do 



June 8 

 ...do 



June 9 



...do 



...do 



...do 



June 10 

 ...do 



June 10 July 4 

 ...do ...do 



...do do 



July 9 

 July 11 



...do 



July 8 

 July 26 

 July 14 

 July 9 

 July 11 



...do 



...do 



July 18 

 July 16 



July 22 



9 

 9 

 9 

 8 

 S 

 8 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 10 

 10 

 9 

 9 

 9 

 9 

 9 

 9 

 9 



! 



9 



ated in f 



24 

 24 

 24 

 23 

 25 

 26 

 21 

 23 

 23 

 23 

 23 

 24 



5 

 7 

 7 

 4 



IS 

 5 

 3 

 3 

 3 

 3 



10 

 7 



13 



51 



July 27 



16 



56 



June 13 

 ...do 



June 15 



...do 



...do 



...do 



...do 



...do 



...do 



...do 



June IS 



...do 



...do 



...do 



...do 



...do 



June 19 

 do 



July 8 

 July 9 

 July 6 

 July S 



...do 



...do 



...do 



July 9 



Aug. S 

 July 31 

 July 23 

 July 26 



...do 



...do 



Aug. 3 

 Aug. 1 



* July 31 



2 July 25 



13 

 17 

 14 

 15 

 15 

 15 

 16 

 16 



64 

 56 

 47 

 50 

 50 

 50 

 58 

 56 

 55 

 49 











July 8 

 July 12 

 July S 

 July 9 



...do 



July 12 

 July 8 

 July 13 

 July 14 



...do 



July 15 

 July 6 



eding, 20. f 



July 11 

 July 24 

 July 12 

 July 13 

 July IS 

 Julv 14 

 July 13 

 July 23 



...do 



July 21 

 July 22 

 July 10 



days. 



20 

 24 

 20 

 21 

 21 

 24 

 19 

 24 

 25 

 25 

 26 

 16 



ruit; ay 



3 

 12 

 4 

 4 

 9 

 2 

 5 

 10 

 9 



4 

 ;rage fee 





Aug. 7 

 July 31 

 July 30 

 Aug. 3 

 July 31 

 July 29 



14 

 19 

 17 

 16 

 17 

 16 



60 

 52 

 51 

 55 

 52 

 49 



...do do 



...do ...do 



Aug. 5 







15 



56 



26 June 11 June 20 

 i Bagged fruit; ayerage fe 



July 23 

 2 Pup 



13 

 ding, 21. 



42 

 4 days. 



