12 
FIRST GENERATION. 
INCUBATION PERIOD OF FIRST-BROOD EGGS. 
Table XV. — Incubation period of first-brood eggs of the grape-berry moth, Sandushy, 
Ohio, 1917. 
Date of opposition. 
I Incuba- 
D ate of Number | tion 
hatching, oflaryae. \ period 
(in days). 
June 21. 
30. 
30. 
30. 
July 
June 28 
4 
July 4 
28 
July 5 
18 
July 6 
8 
July 8 
1 
July 5 
24 
July 6 
6 
July 7 
2 
July 6 
18 
July 7 
2 
July 24 
i 
July 25 
2 
July 26 
1 
July 28 
1 
July 28 
2 
July 30 
4 
July 29 
2 
July 30 
3 
July 30 
27 
July 31 
11 
Total. 
Average length of incubation period, 4.39 days. 
Maximum length of incubation period, 8 days. 
Minimum length of incubation period, 3 days. 
LENGTH OF FEEDING PERIOD OF FIRST-BROOD LARY.E. 
Records from trie date of hatcning until date of leaving fruit were 
secured on 70 larvae in the insectary. 
Table XVI. — Length of feeding period of 70 first-brood larrse of the grape-berry moth in 
grapes in rearing jars in the insectary, Sandusky, Ohio, 1917. 
Number oflaryae. 
Larvae 
hatched. 
Larva? 
left fruit. 
Feeding 
period. 
Number o f laryae . 
Laryae Larva? 
hatched, left fruit. 
Feed- 
ing 
period. 
2. 
July 3 
.do 
July 21 
July 25 
July 26 
July 29 
July 30 
Aug. 5 
July 19 
July 21 
July 22 
July 23 
July 24 
July 27 
July 28 
July 29 
Aug. 5 
July 19 
July 20 
July 21 
Julv 22 
July 23 
July 24 
Days. 
18 
22 
23 
26 
27 
33 
15 
17 
18 
19 
20 
23 
24 
25 
32 
14 
15 
16 
17 
18 
19 
2 
Julv 5 Jnlv 25 
Days. 
20 
2. 
1. 
July 28 
Jnlv 29 
23 
1 
.do 
2. . 
July 5 
24 
1.""""""""""] 
1 
2 
...do 
...do 
...do 
July 4 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
.do 
1 
2 
3 
...do July 31 
...do Aug. 1 
...do Aug. 2 
...do Aug. 6 
July 6 1 Julv 22 
26 
27 
28 
32 
3. . 
16 
2 . 
6 
2 
iSSS"f.'.'.'.'.'.\'.\'.\V.\\ 
1 
1. 
6 
! 1 
1 
j 1 
l.Y/"////.'.'.'.'.""'.'.'. 
i. 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
July 23 
July 26 
July 27 
July 30 
Julv 31 
Aug. 1 
Aug. 2 
Aue. 12 
17 
20 
21 
24 
25 
26 
27 
1. 
July 5 
...do 
...do 
i 
i. 
...do 
37 
i 
July 7 i Julv 21 
14 
3. 
i... 
Julv 25 
18 
4 
3. 
...do 
...do 
:: 
2. 
...do 
1 
Average days, 20.62. 
Maximum days, 37. 
Minimum days, 14. 
