PROGRESS REPORT ON THE EUROPEAN CORN BORER 
85 
APRIL 
5 a 

MAY 
!0 3 
1 
JUNE 
?0 J5 
J U L.Y 
20 
AUGUST 
1 10 to 
SEPTEMBER OCTOBER 
1 10 10 30 10 ?0 3) 
_^ 
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OVERW 
E c 
NTERl 
N .GE 
IB UAS 
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ATIC 
)N 
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:cuRREr 
EUROPE 
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AN 
IN 1 
COP 
HE 
pN P 
FIEL 
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R 
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UPA 
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DN 
19; 
ne:w e 
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id.GE 
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A 
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(FROM 
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Fig. 43. — Seasonal history in New England during 1922. Black areas denote actual 
field counts. Areas inclosed by dotted lines show the probable occurrence of eggs 
and immature larvae, and the length of life of adults, as determined by plotting 
rearing records and from field observations 
APRIL MAY 
1 ft 30 Jfl 20 
JUNE JULY AUGUST SEPTEMBER OCTOBER 
10 10 » 10 ZB SI 10 ?0 3 10 ?0 3.0 10 ?,0 h 
occ 
UR 
RFN 
-.F 
N T 
HF 
FIE 
i n 
L 
.AR 
1/AE 
ElUf 
TOP 
AVE 
E AN 
:ra< 
CO 
JE 1 
JRN 
920 
BOF 
-10 2 
LFR 
2 
t 
>JLW 
YOF 
K 
P 
(fk» ov 
UP/A 
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E 
<j LAJIW£ 
1 
g-J 
\DU(_TS| 
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EGG3 
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wf^ 
•■ l 
Pig. 44. — Seasonal occurrence of European corn borer in the infested areas of 
New York. Averaged from data obtained during the period 1920 to 1922, 
inclusive 
