GRAPE-BEERY MOTH IN NORTHERN OHIO. i 
The average length of the prepupal period was 4.15 days, the 
maximum 7 days, and the minimum 3 days. 
TIME OF COCOONING OF THE SECOND-BROOD LARVM. 
In an effort to determine the percentage of worms normally re- 
moved from the vineyards with the harvested grape crop the following 
records were secured: 
Table VIII. — Time of cocooning of the second brood of the grape-berry moth at Sandusky, 
Ohio, in 1916. 
Date of cocooning. 
Aug. 22 
Aug. 23 . 
Aug. 24. 
Aug. 25 . 
Aug. 28. 
Aug. 29 . 
Aug. 30. 
Aug. 31. 
Sept. 1 . 
Sept. 2. 
Sept. 4. 
Sept. 5. 
Sept. 6. 
Sept. 7. 
Sept. 8. 
Sept. 9. 
Sept. 10 
Sept. 11 
Sept. 12 
Sept. 13 
Sept. 14 
Sept. 15 
Sept. 16 
Sept. 17 
Sept. 18 
Sept. 19 
Sept. 20 
Sept. 21 
Sept. 22 
Sept. 23 
Sept. 24 
Sept. 25 
Sept. 26 
Number 
of co- 
coons. 
1 
1 
6 
3 
44 
5 
39 
43 
157 
121 
350 
163 
120 
335 
340 
254 
153 
343 
309 
402 
233 
197 
94 
145 
114 
101 
142 
251 
171 
94 
68 
126 
128 
Date of cocooning. 
Sept. 27.... 
Sept. 28.... 
Sept. 29.... 
Sept. 30.... 
Oct. 1 
Oct. 2 
Oct. 3 
Oct. 4 
Oct. 5 
Oct. 6 
Oct. 7 
Oct. 8...... 
Oct. 9 
Oct. 10 
Oct. 11 
Oct. 12 
Oct. 13 
Oct. 14 
Oct. 15 
Oct. 17 
Oct. 19 
Oct. 21 
Oct. 23 
Oct. 25 
Oct. 27 
Oct. 29 
Nov. 1 
Nov. 3 
Nov. 5 
Nov. 7 
Total 
Number 
of co- 
coons. 
46 
18 
33 
40 
64 
87 
119 
64 
51 
55 
16 
10 
15 
9 
15 
14 
9 
16 
8 
6 
5 
4 
Larvae began to leave the grapes as early as August 22 and con- 
tinued to leave as late as November 7. The table further shows 
that 77 per cent of the larvae left the fruit previous to September 25, 
the date of the beginning of the Concord harvest, and that 90 per cent 
had left the grapes previous to the beginning of the Catawba harvest 
on October 3. From these data it would seem that little control 
is effected by the removal of the worms with the crop. 
SEASONAL-HISTORY STUDIES, 1917. 
The 1917 rearing records begin with the emergence of spring-brood 
moths from overwintered pupae. These pupae were kept under a leaf 
blanket in the insectary yard, a condition similar to that in a pro- 
tected part of the vineyard. At the time when " plowing away" 
from the vines began in the Sandusky section May 14, the cocoons 
were moved from the wintering place to the insectary, placed in rear- 
ing jars, and records of moth emergence taken as shown in Table IX. 
