GRAPE-BERRY MOTH IN NORTHERN OHIO. 
PERCENTAGE OF EMERGENCE OF SPRING MOTHS. 
25 
The overwintering material was collected and kept under the same 
conditions as that of the previous winter. The percentage of emer- 
gence was slightly higher but still indicating a high rate of mortality. 
Table XXIX. — Percentage of emergence of spring moths of the grape-berry moth, San- 
dusky, Ohio, 1918. 
Source of material. 
Numbei 
of co- 
coons. 
Number 
of moths 
emerged. 
Emer- 
gence. 
Collected as larvae at Venice, Kelleys Island, Put in Bay, and Dover, Ohio 
2,544 
681 
Per cent. 
26.70 
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Fig. 4.— Diagram showing emergence of spring brood of moths of the grape-berry moth at Sandusky, Ohio, 
1918. 
The winter of 1917-18 was the most severe of 47 years on record 
at the Sandusky station of the United States Weather Bureau, and 
included intensely cold periods with little covering. This is of 
importance in connection with the foregoing records, for it must be 
concluded that the' grape-berry moth pupa? are very resistant to 
severe winter conditions. 
