GRAPE-BERRY MOTH IN NORTHERN OHIO. 
5 
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. 
3 
9 
Emergence. 
First 
oviposition. 
Last 
oviposition. 
Before 
oviposition. 
Of ovi- 
position. 
From 
emergence 
to last ovi- 
position. 
1 
2 
14 
12 
(i) 
9 
9 
18 
C 1 ) 
14 
July 24.... 
July 27 
July 28. . . . 
Aug. 5-6. . 
Aug. 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 
3 
4 
3.4 
6 
2 
1.6 
3 
1 
4.6 
Maximum 
Minimum 
8 
2 
1 No record. 
SECOND GENERATION. 
able 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 
No record. 
2 
Do. 
3. 
52. 
4.. 
39. 
5 
6.. 
Do. 
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 larvae had hatched 
by August 25. 
