jan. 5,1924 The European Corn Borer versus the Corn Earworm 
Table 1 . —Infestation of field corn by the corn earworm, Heliothis obsoleta Fab., and 
the European corn borer, Pyrausta nubilalis Hbn., at Arlington, Mass., October id, 
IQ 2 I —Continued 
Number and location of larvae found. 
Part' nf par 
i w* 
j 
Ear No. 
Com earworm. 
European com borer 
or injured. 
j s 
■! § 
12 
£ 
i Husk. 
33 
j_ 
Tip. 
| Middle. 
i Butt. 
j Peduncle. 
| Husk 
[ 
M 
73 
Cob. 
: Q 
; £ 
Middle. 
T~. 
! 
i 2 
| K 
Peduncle, j 
Husk. 
Silk. 
Cob. j 
Grain. | 
Total grains 
'X 
t/5 
Z 
*3 
u- 
c 
44. 
| 
j 
i x 
1 
1 
f 
! 
j 2 
1 
: 4- 
! + 
i 4- 
4- 
4 
j 284 
i 16 
46 . 
47 . 
i 
| 1 
1 1 
i 
1 
1 I 
1 1 
i r 
4- 
4- 
I 4- 
! + 
! + 
i + 
i 4> 
! + 
4 
0 
4 
4 
1 256 
j 192 
22 
1 
1 51 
48. 
ao. 
| i 
! 1 
j 1 
j.... 
1 I 
i I 
| 
0 
0 
i 0 
i + 
4 
+ 
4 
4 
i 336 
| 320 
! 23 
! 25 
50.j_ 
i 
I 
! I 
! a 
i 3 
rr 
.... 4* 
! -T 
i 4- 
! 4- 
4 
4- 
4 
4 
1 288 
: 320 
i 16 
1 15 
S3. 
! 
! 1 
j. . , , 
1 
! j 
2 
1 J 
j I 
_i.. 
1 4- 
1 4- 
: 4- 
! -r 
4- 
i + 
4 
4- 
4 
0 
4 
4 
| 332 
! 284 
I 280 
■ 0 
! ?4 
j ao 
55 . 
56 . 
t ■ ■ • * 
1 1 
I 
j 1 
! I 
|.... 
1 
2 
j I 
1 ■ ■ • • 
j.... 
i + 
i -i- 
! 4- 
j 4- 
4 
4 
4 
4 
! 280 
! 340 
j 368 
36 
1 39 
57. 
1.... 
1 I 
i.... 
i 
! 
i 4- 
0 
i 4 
i 29 
58 . 
59 . 
60 . 
61 . 
* •.. • 
i 
i * * * * 
!. 
i ‘ ■' 
; a 
! a 
j a 
i # _ 
i 
r.. * 
j 
11 
1 1 ; 
! 1 j 
I 
I | 
I 
.... 1 0 
.... 0 
.... 0 
*+ 
i 4- 
! + 
i 4- 
; + 
! -4 
• -U 
0 
4- 
4 
! 4 
1 + 
It 
j 336 
! 2561 
j 280 1 
1 360 j 
16 
24 
r8 
15 
6 a . 
63. 
1.... 
a 
! a 
t 
i 
I 
. • . . : O 
O 
; 4- 
0 
i t 
| 4- 
1 4* 
0 0 c 
I 4 
! 0 
i 376 i 
I a88 ! 
3© 
5^ 
O 
64 . 
65 . 
i 
i 2 
!. . 
1 
! a 
| 1 
I 
2 ; 
1 | 
I 
4- 
| 4 
1 4- 
4- 
14 
1 * 
t 
! 256 
V 
40 
66. 
j 
! 
j 2 
J 
1 ■ 
i -r 
1 4* 
4 
i 320 ' 
r8 
67. 
| 3 
I 
| 1 
| + 
j 0 
: 4- 
! 4- 
0 
0 
+ 
1 
1 392 j 
1 *2 70 I 
3* 
68.. 
69. 
I i 
1 
i 
i 1 ; 
1 
.... 
....; -4- 
i 
• 1 
- 4- 
0 
4 
256 ! 
8 
70. 
I 1 
x ! 
1 1 
: 1 ; 
j x 
! t 
+ 
4 
304 | 
rr 
7i. 
j I 
. . ! . . . J 
I 
T 1 
~r 
; 4~ 
0 
+ 
240 ; 
336 j 
384 j 
23 
72. 
j 
1 
j 
I 1 
; 
j 
1 i 
0 
4- 
1 ! 
+ 
1 
J 
4 
54 
73. 
.. f 
!. 
j 
!.... 
1 . 
_. j 
; ' 1 
4 
4 ' 
4 
35 
74. 
. i 
3 
I j 
1 
’ * ' ‘ 
1 1 
1 i 
I ! 
I ! 
I 
..... -1- j 
i 4- 1 
! + i 
4- ! 
4- 
1 1 
4 ! 
+ 1 
284 ! 
336 ■ 
256 ! 
?4 
75. 
1 
1 
1 
... J 
a j 
.... 
i 
..... ~r : 
4- ! 
4- 
4 
4 
T 1 
92 
a 
77. 
l 
1 ' 
i j 
2 
; i 
* * * * , * ! 
4- ( 
1 ! 
t 
4- 
4 | 
328 j 
44 
78 . 
a 
I ! 
I | 
4 " : 
4- j 
■4 
0 
0 
4 1 
4 ; 
2401 
208 ; 
37 
26 
80 . j 
. i 
I ! 
a 1 
1 
x 
....| 
i \ 
1 i 
T J 
3 
0 : 
4- | 
4- ! 
-j, ! 
4- 
1 
4 
4 j 
130 ! 
62 
81 . i_I 
3 i 
-‘1 
I 
J ■ 
1 ! * 
4- : 
4- ; 
*r 
0 
4 ; 
256 ! 
43 
8a .| 
! 
* * * * f 
2 ; 
l 
‘ ‘ " j 
I 
I 
::::! + ! 
4- 
4- 
4 
0 
4 j 
4 1 
256 ! 
272 ; 
288 : 
33 
35 
76 
84. 
1 
1 ! 
....j 
2 j 
I 
1 
i 
“1 
2 . 
•** 4 
2 
....! 4- | 
4- 1 
4- 
1 
4 
t 
4 i 
1 
85. 
J 
a j 
I | 
j 
j ; 
1 
1 
4- I 
r 
4 - 
4^ 
4- 
1 
* 
4 ! 
^ i 
4 
208 ! 
48 
86. 
I 
a 
i 
i 
1 ! ' 
‘"'I 
1 
4- 
4- 
+ 1 
344 | 
320 ; 
262 ; 
IS 
87. 
aft 
* 1 
1 
I 
1 r 
••••i i 
T 
4- 
O ; 
4 
4 i 
4 ; 
O 
51 
89. 
a 
• •. • | 0 i 
I A j 
4- 
4- 
4- 
l 
4- 
1 
0 
4 : 
4 ! 
172 ; 
15 
90. 
...J. 
I A i 
1 
0 
1 
172 
47 
91 . 
1 
1 
; i 
■ i 
"T 
1 - I 
*r 
i 
-r 
0 1 
280 : 
0 
92 . 
1 
1 
i 
! 
1 
■■'i 
I 
.i l 
, 1 
"r 
4- 
. 1 
0 
4 | 
356 ; 
272 1 
la 
93 . 
I 
1 | 
I 
x ! 
4 ; 
i 
'Vi f 
*T- 
i 
+ 
4 j 
10 
47 
94 . 
3 j 
■ '1 
I 
i ' i 
i 
-1. 
+ 
-1 
+ 
4 ! 
1 ! 
224 ; 
95. 
1 
1 
i' 
1 
1 
i 
0 
i ! 
286 ! 
32 
96 . 
3 
I 
• • • t 
2 
T i 
*T“ 
+ 
4 - 
+ 
.L, 
4 . 
1 
27a ; 
5 x 
97 . 
1 
2 
I 1 
J 
j 
j 4 - 
r 
j. 
1 
r ; 
1 i 
320 ! 
102 
98. j 
! 
I j 
I 
i 
"! 
1 
♦ . . T 
1 
i 
i 
O 
i 
T 1 
1 1 
288 : 
44 
99 . 
I | 
1 
! * 
2 
I 
1 
1 
1 
+ 
4 ] 
1 
380 j 
58 
100. !. 
1 { 
j _i_ 
4 
1 
O 
i- ! 
1 1 
286 ' 
272 j 
54 
i 
1 * 
1 
1 1 * 
. ,. . j { 
+ f 
c 
+ ! 
48 
Per cent of ears infested: 
By either species. 
By both species.. 
By European corn borer.. 
By corn earworm. 
Average number of com earworms per infested ear. 
Average number of European com borers per infested ear 
Total grain destroyed by both species. 
Per cent of stalks infested (25 stalks). 
Infestation per stalk: 
Greatest. 
Least.. 
Average. ' ’ ’ 
Greatest grain injury on any one ear. 
. per cent. 
. roo 
71 
. 88 
83 
per cent.. 
10. 
100 
21 
4 
9 - 
per cent 
3 a 
V-9 
