GRAPE-BERRY MOTH IN NORTHERN OHIO. 
23 
number of larvae were thus removed occurred to the writer, but an 
estimate of one-third would be conservative. This had a decided 
influence on the number of overwintering pupae and subsequent 
infestation in 1918. 
Table XXVI. — Percentage of cocooning previous to and during grape harvest, Sandusky, 
Ohio, 1917, 
Time. 
Date. 
Number 
of 
cocoons. 
Percent- 
age of 
total. 
To Oct. 8 
1,291 
653 
1,944 
2,174 
2,309 
55.91 
Oct. 8-18 
To Oct.18 
28.28 
84.19 
To Oct. 22 
94.16 
To Nov. 10 
100.00 
OFG4flP£S* 
j;ocoo/v/m<s 
£T/f£P&C/VCE 
op- 
Morns 
VEPOsmon 
COCOONING 
H/BEPNAT/OH Or 
pipst bpooo 
pupae: 
Fig. 3.— Diagram showing summary of the life-history data for 1917 of the grape-berry moth. Solid lines 
indicate actual records and dotted lines indicate occurrence of stages as observed in the field and com- 
puted from the average length of period. 
SUMMARY OF SEASONAL-HISTORY STUDIES IN 1917. 
A summary of the data presented in the preceding tables is shown 
graphically in figure 3. 
It should be kept in mind in applying this diagram to future 
seasons that the season of 1917 was later than the average for northern 
Ohio and' was unseasonably wet and cold throughout the fall. 
