BULLETIN 911, U. S. DEPARTMENT OF AGRICULTURE. 
Table IX. — Time of emergence and sex of moths of the spring brood of the grape-berry 
moth. Sandusky, Ohio. 1917. 
Date of emergence . 
Number of moths. 
Mean 
daily ] 
tem- 
pera- 
ture. 
Date of emergence. 
Number of moths. 
Mean 
daily 
tem- 
pera- 
ture. 
J 
5 
'$ 
Total. 
<? 
? 
l § 
Total. 
June 9 
2 
1 
1 
1 
1 
1 
3 
9 
16 
1 
6 
46 
6 
51 
82 
56 
31 
90 
39 
79 
36 
37 
27 
31 
32 
35 
46 
26 
38 
...... 
2 
...... 
1 
...... 
3 
....... 
1 
2 
3 
2 
...... 
1 
...... 
2 
1 
3 
3 
1 
o 
3 
17 
2S 
2 
19 
SI 
9 
64 
102 
76 
38 
124 
53 
9S 
54 
49 
33 
33 
3S 
41 
51 
34 
46 
62 
62 
70 
72 
51 
54 
60 
73 
66 
68 
68 
72 
62 
63 
78 
69 
70 
68 
69 
76 
69 
64 
63 
64 
66 
74 
71 
76 
July 10 
5 
2 
10 
1 
4 
8 
7 
5 
1 
4 
3 
5 
2 
1 
1 
35 
6 
37 
6 
20 
22 
20 
27 
12 
2S 
4 
14 
11 
7 
8 
7 
2 
I 
2 
2 
2 
1 
1 
1 
1 
...... 
1 
...... 
3 
2 
...... 
1 
...... 
...... 
40 
8 
47 
24 
31 
28 
32 
13 
34 
10 
21 
13 
65 
June 10 
July 11 
63 
June 12. 
2 
2 
July 12 
66 
June 13 
July 13. . 
64 
June IS 
July 14 
70 
June 16 
1 
72 
.Time 17 
74 
.Tune 1* 
5 
10 
1 
10 
34 
3 
13 
18 
17 
32 
13 
17 
15 
10 
6 
1 
5 
6 
5 
4 
8 
July 17 
72 
June 19 
July IS 
July 19 
70 
June 20 
71 
June 21 
July 20 
July 21 
76 
June 22. . 
76 
June 23 
July 22 
7rt 
June 24. . 
July 23. . 
8 78 
July 24 
9 
8 
3 
1 
10 
2 
3 
2 
2 
1 
1 
1 
80 
June 26 
July 25 
7S 
June 27 
July 26 
SO 
June 28 
July 27 
76 
June 29. 
July 28 
72 
June 30. . 
July 29 
86 
Julyl 
July 2. 
July 30 
87 
July 31 
88 
Julv 3. . . 
Aug.l 
Aug. 2 
1 
SS 
July 4 
74 
SO 
July 6 
Aug. 10 
Total 
66 
July 7 
Julv S.' ".'.'".'.'".. 
July9 
305 
1,116 
43 
1 3 464 
§ Denotes specimens the sex of which was undetermined. 
SPRING BROOD. 
EMERGENCE OF SPRING-BROOD MOTHS. 
In addition to the time of emergence and number of moths emerg- 
ing each day, the sex of the moths was determined and recorded. 
Moths began to emerge June 9, but did not emerge in any con- 
siderable numbers until June 22. (Fig. 2.) From this date emergence 
was heavy for about 10 days and then fell off gradually until the 
end of the emergence period on August 10. 
RELATION OF EMERGENCE OF SPRING MOTHS TO GRAPE BLOOM. 
The relation between the time of emergence and the blossoming 
period of grapes is of interest in substantiating earlier records. 
Table X. — Relation between the time of emergence of the spring brood of grape-berry moths 
and the period of grape bloom, Sajidusl'y. Ohio. 1917. 
Period. 
Dates inelusiye. 
Male moth, £Sff 
Sex undeter- 
mined inoths. 
Total. 
Num- 
ber. 
Per 
cent. 
Num- Per 
ber. . cent. 
Num- 
ber. 
Per 
cent. 
Num.- Per 
ber. cent. 
Before grape bloom 
During grape bloom 
June 9-20 
21 
179 
52 
53 
6.88 
5S.6S 
17.05 
17.38 
36 
522 
313 
245 
3.22 
46. 77 
28. 04 
21.97 
5 
17. 
8 
13 
11.63 
39.53 
IS 60 
62 4 23 
June 21- July 1 
July 2-11. 
71S 49.04 
373 25 47 
Remainder of season 
July 12-Aug. 10... 
30.24 
311 21.25 
Total. 
1.116 
1.464 
