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. 



Number 

 of co- 

 coons. 



Number 

 of moths 

 emerged. 



E mer- 

 gence. 



Collected as larvse at Venice, Kelleys Island, Put in Bay, and Dover, Ohio 



2,544 



681 



Per cent. 

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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. 



