GRAPE-BERRY MOTH IJST NORTHERN OHIO. 



OVIPOSITION OF FIRST-BROOD MOTHS. 



The oviposition records were secured from some of the moths 

 recorded in Table III. The oviposition of a few of these moths is 

 shown in Table IV. No attempt was made to secure oviposition rec- 

 ords throughout the entire oviposition period. From observations 

 made in the vineyards during the season it was found that the 

 heaviest oviposition was in the period from about August 1 to 10. 

 Freshly deposited eggs were found in small numbers in the vineyards 

 as late as August 17, and eggs were being deposited in the insectary 

 as late as September 1. 



Table IV. — Oviposition by first-brood moths of the grape-berry moth in rearing jars at 



Sandusky, Ohio, in 1916. 





Number of moths. 



Date of— 





Days — 





No. of jar. 



S 



9 



Emergence. 



First 

 oviposition. 



Last 

 oviposition. 



Before 

 oviposition. 



Of ovi- 

 position. 



From 

 emergence 

 to last ovi- 

 position. 



1... 



2 

 14 

 12 

 0) 



3 



9 



9 



18 



0) 



14 



July 24.... 



July 27 



July 28 



Aug. 5-6.. 

 Aue. 22-23. 



July 26. . . . 

 July 30. . . . 



Aug. 3 



Aug. 7-8.. 

 Aug. 26... 



July 26. . . . 

 July 30. . . . 



Aug. 5 



Aug. 11... 

 Aug. 26... 



2 

 3 

 6 

 2-2 

 4 



1 

 1 

 2 

 3 

 1 



2 



2 



3 



3.... 



8 



4 



6 



5 



4 









Average.. 



3.4 



6 



2 



1.6 



3 



1 



4.6 



Maximum 











8 



Minimum 











2 















1 No record. 

 SECOND GENERATION. 



Table V. — Incubation period of second-brood eggs of the grape-berry moth at Sandusky, 



Ohio, 1916. 



Number of observation. 



Date of 

 oviposition. 



Date of 

 hatching. 



Days of 

 incuba- 

 tion. 



Number of eggs. 



1 



Aug. 3... . 

 Aug. 7-8... 

 Aug. 9-10.. 



Aug. 11 



Aug. 27-28.. 



Aug. 30 



Sept. 1 



Aug. 8... 

 Aug. 11.. 

 Aug. 13.. 

 Aug. 16.. 

 Sept. 3.. 

 Sept. 5. . 

 Sept. 6.. 



5 

 4 



. 4 

 5 

 7 

 6 

 5 





2 



Do. 



3 



52. 



4.. 



39. 



5 





6 



Do. 



7 



Do. 







Average length of incubation period, 5.1 days. 

 Maximum length of incubation period, 7 days. 

 Minimum length of incubation period, 4 days. 



The incubation period of second-brood eggs as shown in Table V 

 averaged 5.1 days with 7 days as the maximum time and 4 days as 

 the minimum. It may be assumed then that the earliest second- 

 brood larvae began feeding about July 21, 10 days after the emer- 

 gence of moths on July 11. The hatching, however, was light until 

 about August 5, when larvae began to be present in the vineyards in 

 large numbers. Though some larvae hatched in the insectary as 

 late as September 6, in the vineyards most of the larva? had hatched 

 by August 25. 



