GRAPE-BERRY MOTH IN NORTHERN OHIO. 
27 
not show as well defined a high 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 pupse 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. 
