28 



BULLETIN 911, U. S. DEPARTMENT OF AGRICULTURE. 



Table XXXI. — Time of emergence and sex of first-brood moths of the grape-berry moth, 



Sandusky, Ohio, 1918. 



Date of 



Number of moths. 



Mean 

 daily 

 tem- 

 pera- 

 ture. 



Date of 

 emer- 

 gence. 



Number of moths. 



Mean 

 daily 



emer- 

 gence. 



6- 



9 



<? 



Total. 



3 



? 



§ 



Total. 



tem- 

 pera- 

 ture. 



July 23 



24 



25 



26 



27 



28 



29 



30 



31 



Aug. 1 



2 



3 



4 



5 



6 



7 



8 



9 



1 

 1 



1 



2 



1 

 6 



2 

 2 

 5 

 4 

 4 

 1 

 8 

 6 

 4 

 2 



2 



2 



6 

 9 

 3 

 5 



9 

 2 

 15 

 3 



16 



9 



7 



7 



18 



26 



15 



10 

 9 

 5 



12 

 9 

 8 



15 



1 





 1 

 1 

 3 

 2 

 2 

 3 



4 



2 

 2 

 1 



6 

 11 



4 



5 

 11 



3 

 20 



6 

 24 

 12 



9 



9 

 23 

 34 

 19 



2 

 18 

 17 

 11 

 14 

 10 

 10 

 19 



°F. 



78 

 76 

 80 

 78 

 78 

 78 

 78 

 66 

 66 

 66 

 72 

 66 

 78 

 85 

 94 

 91 

 86 

 78 

 78 

 80 

 79 

 82 

 80 



Aug. 15 

 16 

 17 

 18 

 19 

 • 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 



Sept. 2 

 4 

 5 

 6 



Total- 



1 



1 



2 

 7 

 6 

 14 

 9 

 3 

 2 

 1 

 1 

 1 

 2 



1 



1 

 106 



14 

 3 

 1 



9 



17 



25 



20 



23 



17 



9 



9 



4 



6 



10 



5 



2 



2 



2 

 3 

 2 

 2 

 1 

 1 



15 



3 



2 



9 



19 



34 



29 



39 



28 



13 



12 



5 



7 



11 



7 



2 



2 



1 



1 



1 



3 



"F. 



74 

 71 

 68 

 70 

 68 

 70 

 78 

 78 

 82 

 76 

 74 

 76 

 72 

 73 

 72 

 69 

 68 

 70 



10 

 11 

 12 

 13 

 14 



1 

 1 



2 





68 

 63 

 62 



2 



399 



35 



540 





PROPORTION OF SEXES OF FIRST-BROOD MOTHS. 



Table XXXII. — Proportion of sexes of first-brood moths of the grape-berry moth, 



Sandusky, Ohio, 1918. 



Sex of moth. 



Number 



of 

 moths. 



Percent- 

 age of 

 sexes. 





106 



399 



35 



21.00 





79.00 













Total 



540 



100.00 







The proportion of sexes as shown in Table XXXII maintains the 

 preponderance of females that has been shown in previous tables. 



OVIPOSITION BY FIRST-BROOD MOTHS. 



A single record of oviposition and incubation was secured. In a jar 

 containing 14 male moths and 12 female moths, all of which emerged 

 on August 22, 5 eggs were deposited on August 26 and hatched on 

 September 2. The period from emergence to oviposition was there- 

 fore 4 days and the incubation period 7 days. 



NUMBER OF TRANSFORMING AND OVERWINTERING INDIVIDUALS 



OF FIRST BROOD. 



In Table XXXIII are presented the data on the overwintering 

 first-brood individuals. 



It will be seen that the first larva to hibernate left the fruit on 

 August 2 and that the number gradually increased as the season 

 progressed. 



