16 



BULLETIN 911, U. S. DEPARTMENT OF AGRICULTURE. 



maximum, and. 6 the minimum. On sprayed foliage males were in 

 the cocoons 16.82 days as the average with 20 days as the maximum 

 and 16 days the minimum period. Females were in the cocoons an 

 average of 17.06 days with 27 days as the maximum and 13 days the 

 minimum. 



Table XXI. — Length of time in cocoon of 1.318 individuals of the first brood of the 

 grape-berry moth, Sandusky, Ohio, 1917. 



Sex of moths. 



Number 

 ofmoths. 



Number of days in cocoon. 



Average. 



Maximum. 



Minimum. 





226 



1,003 



25 



15.52 

 14. 62 

 14.32 



32 

 32 

 20 



9 





6 





9 







Total 



1,254 



14.78 



32 



6 







Cocooned on sprayed foliage: 



11 

 53 



16.82 

 17.06 



20 

 27 



16 





13 







Total 



64 



17.01 



27 



13 







TIME OF EMERGENCE OF FIRST-BROOD MOTHS. 



Table XXII. 



•Time of emergence and sex of the first-brood moths of the grape-berry 

 moth, Sandusky, Ohio, 1917. 



Date of emer- 



Number ofmoths. 



Date of emer- 

 gence. 



Number of moths. 



gence. 



S 



? 



§ 



Total. 



3 



$ 



§ 



Total. 



July 29 











1 



2 



4 







1 



4 



1 



7 



4 







2 



7 



7 



2 



20 



19 



24 



10 



21 



19 



6 



23 



19 



13 



9 



5 



1 



1 



6 



5 



4 



3 



12 



8 



16 



20 



33 



5 



25 



26 



43 



14 



66 



110 



128 



41 



85 



49 



55 



105 



61 



66 



44 



27 





 

 1 

 1 

 1 

 1 

 

 

 

 

 3 

 



1 





 

 

 



1 



8 

 3 

 

 4 

 1 

 2 

 

 4 

 1 

 



1 

 1 

 8 

 8 

 9 

 4 



13 



12 



17 



27 



40 



5 



28 



33 



50 



16 



86 



130 



160 



54 



106 



72 



62 



130 



SO 



83 



54 



32 



Aug. 26 



8 

 12 

 7 

 

 14 

 4 

 5 

 2 

 10 

 

 5 

 4 

 1 

 1 

 4 

 1 

 

 1 

 2 

 

 1 

 



1 







1 



2 

 



42 

 50 

 45 

 3 

 23 

 27 

 31 

 27 

 23 

 6 

 3 



20 

 5 

 8 

 14 

 7 

 2 

 3 

 2 

 1 

 2 

 1 

 4 

 1 

 2 

 

 1 





 3 

 1 

 

 

 1 

 1 

 1 

 

 

 





 

 

 

 

 

 

 

 

 

 

 

 

 

 



50 



30 



27 



65 



31 



28 



53 



Aug. 1 



29 



3 



2 



30 



37 



g 



31 



32 



4 



Sept. 1 



37 



5.. 



2 



30 



6... 



3 



33 



7 . 



4 



6 



8 . 



5 



8 



9.. 



6 



26 



10... 



7 



6 



11 



8 



9 



12 



9 



18 



13 



10 



8 



14 



11 



2 



15... 



12 



4 



16 



13 



4 



17 



14 



1 



18 



15 



3 



19... 



17 



1 



20... 



18 



5 



21... 



19 



1 



22 



20 



3 



23 



21 



2 



24 



22 



1 





Total 







316 



1,412 



41 



1,769 



First-brood moths began to emerge on July 29 and emergence 

 continued until September 22. It will be seen in figure 2 that the 

 emergence was high for the entire period of August 12 to 28, varying 

 with the mean daily temperature. It is also shown that the emergence 



