THE CODLIXG MOTH IX MICHIGAN. I ( J 



Table LXXVI. — Observations on the instars of the first-brood codling-moth larva at 



Douglas, Mich., 1911. 





Date of hatching and molting, and larval head measurements in millimeters. 





Number 

 of obser- 



First instar. 



Second instar. 



Third instar. Fourth instar. Fifth instar. 



vation. 



Hatched. 



mm. 



First 

 molt. 



mm. 



Second 

 molt. 



mm. 



Third 

 molt. 



"»»>• ' m"!,'" 



mm. 



1 



June 19 

 ...do.... 



June 27 

 June 28 

 ..do 



0.35 

 .35 

 .35 

 .35 

 .35 

 .35 

 .35 

 .35 

 .35 

 .35 



June 26 

 June 27 

 July 3 



...do 



0.46 

 .45 

 .50 



.49 



July 1 



0.66 

 .65 

 .68 

 .70 

 .60 

 .65 

 .70 

 .65 

 .62 

 .60 

 .70 

 .65 

 .70 



Julv 5 

 July 6 

 July 11 

 Julv 9 

 July 11 

 ...do 



0.83 

 .88 

 .90 

 i 1.10 

 .85 

 .85 



Julv 9 

 ...do.... 

 Julv 16 

 July 13 

 July 17 



...do 



July 12 

 Aug. 1 



1.10 



2 



1.30 



3.. 



Julv 6 

 ...do.... 

 July 9 

 Julv 8 

 July 9 

 ....do... 

 July 11 

 July 14 

 July 15 

 July 14 

 ...do 



1.18 



4 



i 1.50 



5. 



1. 15 



G 



...do 



July 2 

 ...do 



do. . . 



Julv 4 

 Julv 6 

 ...do.... 



.46 

 .46 

 .49 



1.15 



1. 30 



8 



9 



July 24 

 July 17 



.80 

 .81 



1.08 



10. 



June 7 



July 10 



.46 







11. 



July 19 

 July 20 

 July 18 



1.00 

 .89 

 1.08 







12 











July 28 



1. 19 



13. 











14 











July 14 



1.00 





















No. of 

 observa- 

 tion. 



Date of hatching and molting, and lar- 

 val head measurements in milli- 

 meters — Continued. 



Days duration of instars. 



Sixth instar. 



Pupa- 

 tion, 

 sixth 

 molt. 







Fourth Fifth 

 instar.^ instar. 





Fifth 

 molt. 



mm. 



Loft 

 fruit. 



instar. ' instar. instar. 



1 



July 13 



1.40 







7 5 4 



4 4 



2 



Aug. 2 

 July 27 

 July 23 

 Aug. 5 

 July 27 

 Aug. 10 

 lAug. 30 



Aug. 8 

 Aug. 4 

 July 31 

 Aug. 12 

 Aug. 4 



8 

 6 







3 

 5 

 4 

 6 

 6 



1 30 



3 



July 20 



1.50 



3 



5 

 3 

 2 

 3 



4 



4 



5 3 



i 18 





July 29 

 Julv 20 

 July 29 

 Aug. 22 



1.46 

 1.46 

 1.57 



i 1.19 



12 



6 



6 



4 



4 



4 

 3 

 3 



3 





1 17 



8 



i 1.29 



i 15 

 6 



8 



i 21 



9... 





10 









" 



3 4 





11 



July 28 

 Aug. 6 

 Julv 25 

 July 19 



1.51 

 1.46 

 1.50 



1.50 



July 31 



4 

 6 



4 





1'2.. 







8 : 9 



13 



Aug. 4 

 July 27 



Aug. 8 

 Aug. 1 







14. . 









5 





! 





Days duration of instars — Continued. 





No. Of 



observa- 



Sixth instar. 



Total 



larval 



life. 



Remarks. 





Feeding. 



In co- 

 coon. 



Total. 





1 











Died in sixth instar. 



2 













3. 



7 



8 



15 



50 

 33 

 45 

 37 



Moth emerged Aug. 19; below average size. 

 Moth emerged Aug. 13; below average size. 



4 



5 



7 



7 

 12 



7 



8 



14 

 15 



Moth emerged Aug. 25: average size. 



6 



Moth emerged Aug. 16; below average size. 



7 



Normal size: larvae wintered. 



8 







59 



Deformed; died Sept. 9. 



9 









Deformed; died July 24. 



10 











Died Julv 18. 



11 



13 









Died before pupation. 



12 







Moth emerged Aug. 21; normal size. 



13 



10 

 8 



4 ; 14 



5 1 





Died Aug. 20. 



14 





Moth emerged Aug. 12; normal size. 













i Abnormal and not included in the summary. 



