THE GKAPE-BERKY MOTH. 



37 



Table IX. — Summary of Table VIII showing number and percentage of first-brood 

 larvx of the grape-berry moth that transform. 



Observations on- 



Number of larvae 



Number of moths emerged . . . 

 Number of hibernating pupae 

 Number of parasitized larvae . 

 Number of dead individuals . 



Length of life cycle of first generation. — The results of the pre- 

 ceding observations on the separate stages of the grape-berry moth 

 have been summarized in Table X, which shows an average period 

 of 44.2 days for the life cycle of the first generation. 



Table ~K.—Life cycle of the first generation of the grape-berry moth as determined from 

 observations on the separate stages; summaries from the previous tables. 



Stages of development. 



Average. 



Maximum. 



Minimum. 



Egg stage 



Days. 

 6.0 

 23.0 



1 15.2 



Days. 



8 

 33 



25 



Days. 



4 





19 









10 









44.2 



66 



33 







Table XI. — Life cycle of the first generation of the grape-berry moth, as observed 

 rearing in 1909 at North East, Pa. 



No. 



Dates of — 



Days duration — 



Egg 

 deposi- 

 tion. 



Hatch- 

 ing. 



Leaving 

 fruit. 



Pupa- 

 tion. 



Emerg- 

 ence of 

 moths. 



Incu- 

 bation 

 of eggs. 



Feed- 

 ing 



period 

 of 



larvae. 



Larva? 

 mak- 

 ing 

 cocoon. 



Pupal 



stage 



Life 

 cycle. 



1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 



A 



July 2 

 July 3 

 July 5 

 July 7 



...do 



July 8 



...do 



...do.... 

 July 9 



...do 



...do.... 

 July 10 



July 10 



July 11 

 ...do 



July 12 

 ...do 



July 13 



...do 



...do 



...do 



...do 



...do.... 



July 16 



Aug. 5 

 Julv 31 



...do 



...do 



Aug. 9 





8 

 8 

 6 

 5 

 5 

 5 

 5 

 5 

 4 

 4 

 4 

 6 



26 

 20 

 20 

 19 

 25 

 22 

 23 



4 







Aug. 14 

 Aug. 18 

 Aug. 16 





42 



44 

 40 













Aug. 6 

 Aug. 4 

 Aug. 5 



Aug. 5 

 Aug. 6 

 Aug. 15 

 Aug. 5 



Aug. 7 

 Aug. 6 

 ...do 



Aug. 6 

 Aug. 7 

 Aug. 17 

 Aug. 8 



1 

 2 

 1 











. Aug. 19 

 ...do.... 



13 



42 



42 



23 

 24 

 33 

 20 



1 

 1 

 2 

 3 











Aug. 31 



14 



53 











5.4 

 8 

 4 



23.2 

 33 

 19 



1.9 

 3 

 1 



• 13.5 

 14 

 13 



43.8 

 53 

 40 



M 





M 









The average figures in Table X agree closely with the results 

 obtained from the rearings of life-cycle series (Table XI). It will 

 be noted under the life-cycle column that six individuals completed 

 their life cycle the same season, while six pupae wintered. The shortest 



