86 
BULLETIN 1476, IT. S. DEPAETMENT OF AGRICULTURE 
OHIO 
Owing to the comparatively sparse infestation existing in Ohio, 
it has not been possible to conduct extensive or detailed field studies 
to determine dates of seasonal occurrence. During 1923 and 1924, 
however, some preliminary data were accumulated upon this point 
by F. W. Poos and L. H. Patch, a summary of which appears in 
Table 23, showing the seasonal occurrence of each stage. Most of 
these observations were made in the vicinity of Sandusky, Ohio. 
Table 23. — Summary of seasonal-occurrence notes on the European corn borer 
at Sandusky, Ohio, for 1923 and 1924 
Date of first record 
Date of greatest abundance 
(approximate) 
Stage 
1923 
1924 
1923 
1924 
Labora- 
tory 
Field 
Labora- 
tory 
Field 
Labora- 
tory 
Field 
Labora- 
tory 
Field 
June 15 
June 26 
July 2 
July 9 
June 20 
July 1 
July 5 
June 23 
July 2 
July 9 
July 11 
June 28 
July 16 
July 18 
July 10 
July 25 
Adult 
Egg 
July 16 
July 11 
Larva. . . 
Aug. 5-10 
Aug. 20 
Date of last observed record 
Stage 
1923 
1924 
Labora- 
tory 
Field 
Labora- 
tory 
Field 
July 2 
Aug. 8 
July 31 
Aug. 12 
Sept. 2 
Adult. - 
Egg... 
Aug. 3 
0) 
0) 
Overwintered 
LIFE HISTORY 
EASTERN NEW ENGLAND 
The seasonal occurrence of each stage of the corn borer in eastern 
New England for the period 1918 to 1922 has been given in Figures 
41, 42. and 43. The average duration of the stages of Pyrausta 
nubilalis in eastern New England, as obtained from insectary records 
at Arlington, Mass., during the period from 1919 to 1921, inclusive, 
are shown in Table 24. 
