24 
SEASONAL-HISTORY STUDIES, 1918. 
SPRING BROOD. 
TIME OF EMERGENCE AND SEX OF MOTHS OF THE SPRING BROOD. 
Table XXVII shows the dates of emergence of spring-brood moths 
and the number of each sex that emerged each day. 
Table XXYII. — Time of emergence and sex of moths of the spring brood of the grape- 
berry moth, Sandusky. Ohio, 1918. 
Date of 
Number of moths. 
Mean 
daily 
temper- 
ature. 
I 
Date of 
emer- 
gence. 
Number of moths. 
Mean 
daily 
temper- 
ature. 
gence. 
c? 
? § 
Total. 
c? 
9 § 
Total. 
Mav 22 
1 
1 


1 
4 
3 
2 
12 
12 
14 
6 
9 
12 
4 
5 
10 
10 
5 
7 
2 
6 
3 
4 
1 
4 
4 
5 
3 
13 
16 
10 
36 
36 
42 
25 
29 
36 
21 
11 
36 
30 
12 
38 
14 
29 
11 
12 
74 
72 
78 
78 
66 
64 
72 
78 
81 
75 
68 
74 
67 
73 
66 
64 
69 
66 
70 
72 
62 
66 
64 
72 
26 
34 
19 
9 
7 
16 
12 
15 
14 
12 
9 
12 
16 
I 
1 
3 
5 
2 
3 
4 
1 
1 
70 
25 
26 
27 
28 
29 
30 
31 
June 1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
3 
2 
4 
2 
9 
11 
6 
21 
17 
26 
17 
20 
22 
17 
6 
25 
20 
6 
30 
12 
22 
8 
7 
2 
1 

2 
2 
3 
7 
2 
2 
2 
i" 
i 
l 
i 
i 
18 
19 
20 
21 
23 
24 
25 
26 
27 
28 
29 
30 
July 1 
o 
3 
4 
5 
6 
7 
9 
12 
Total . . . 
3 
2 
1 
2 
i* 
4 
i 
2 
3 
i* 
16 
6 
6 
14 
12 
13 
10 
11 
7 
8 
13 
8 
4 
1 
2 
2 
2 
2 
4 
1 
1 

i 
i* 
i" 
l 
2 
i 
2 
i 

65 
66 
61 
70 
62 
66 
66 
66 
76 
74 
74 
75 
62 
62 
72 
73 
76 
72 
63 
64 
66 
161 
482 
38 
681 
The early opening of the season hastened the grape growth and 
moth emergence was correspondingly early. The first emergence 
took place on May 22 and emergence in considerable numbers began 
on June 1. A rather high rate of emergence prevailed for about a 
two-week period and then gradually subsided. (Fig. 4.) 
PROPORTION OF SEXES OF MOTHS OF THE SPRING BROOD. 
Table XXVIII. — Proportion of sexes of moths of spring brood of the grape-berry moth, 
Sandusky, Ohio, 1918. 
Sex of moths. 
Number 
of moths. 
Percent- 
age of 
sexes. 
Male 
161 
482 
38 
25.04 
Female 
74.96 
TTnrietermiTiPfi , 
Total 
681 
100.00 
The proportions as shown in Table XXVIII are comparable with 
the figures in Table XI on the spring brood of moths in 19-17. It 
appears that the preponderance of females is the usual condition. 
