GRAPE-BERRY MOTH IX NORTHERN OHIO. 



27 



not show as well denned a nigh period as usually exists; the com- 

 parative dearth of rearing material is thought to account for this 

 condition. 



TIME OF EMERGENCE AND SEX OF FIRST-BROOD MOTHS. 



The dates of emergence and number of moths are shown in Table 

 XXXI and in graph in figure 5. Attention is directed to the rise in 

 emergence on August 4 and 5 and then the sudden drop without 

 another high point until August 20. The writer accounts for this, 

 partly by a comparable drop in the cocooning in the period previous 





















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Fig. 5.— Diagram showing dates of emergence and number of moths of the grape-berry moth at Sandusky, 



Ohio, 1918. 



and partly by an actual killing of the pupae by excessive heat that 

 prevailed on August 5 to 8. On August 5 the official Weather Bureau 

 records showed a maximum temperature of 94° F. , on the 6th 105°, 

 on the 7th 100°, and on the 8th 97°. When emergence dropped 

 off suddenly on August 6 and 7 examination of the pupae then about 

 to transform to moths showed considerable mortality. Extensive 

 records could not be taken without destroying the material that 

 was to serve for further life-history studies. ^ 



