YeJ. XXVII, No. x 
68 
Journal of Agricultural Research 
Table II .—Infestation of field corn by the corn earworm, Heliothis obsoletg Fab., and 
the European corn borer, Pyrausta nubilalis Hbn., at Arlington, Mass., October 20, 
IQ 2 I 
[50 ears of Longfellow flint fleld corn] 
1. 
2. 
3- 
4- 
5 - 
6. 
7. 
3. 
P. 
10. 
11. 
13. 
13- 
14. 
IS- 
16. 
17. 
18. 
19 
30 . 
31 . 
33 . 
* 3 . 
24. 
*5. 
36. 
27. 
38. 
29. 
30. 
31. 
32. 
33 
34- 
35- 
36 . 
37- 
38. 
39 
40. 
41- 
43. 
43 
44 
45 
46. 
47. 
48. 
49 
50 
Number and location of larvae found. 
Corn earworm. 
European com borer. 
^ar No. 
Husk. 
Silk. 
Tip. 
Middle. 
Butt. 
1 Peduncle. 
l 
j Husk. 
Silk. 
i 
| 
I 
II 
Tip. 
! Middle. 
u 
H 
1 
2 
1 1 ! 
; i 
i ; 
I 1 
2 
2 
2 ' 
I 
t 
I 1 
1 
3 
I 
I ; 
... i 
I i 
I 
1 
1 
1 
1 
.... I 
] 
1 
1 
I 
2 
■ * * * 1 
I i 
j 
I 
1 
I 
1 
I ; 
i 
! 
2 i 
i 
I 1 
! 
1 I 
1 
2 
2 
. . 1 
1 
...J 
J 
1 j 
1 
X 
I 
x ! 
I 
3 
i 
. . . J 
1 
I 
2 
1 
2 
I 
2 
I j 
I 
I 
I 
1 
1 1 
2 
1 
2 
i! 
j 
| 
I 
1 
. . . . 1 
i 
j 
I 
I 
I 
I 
1 
1 
I 
I 
2 
I 
I 
r ‘ 
j : 
1 
I 
I 
I 
1 j 
I 
I 
I 
1 
I 
I 
i j ■ 
I 
1 
I 
1 
1 
1 I 1 
2 
I 
I ! 
1 
2 
2 
I 
1 
i 1 
t : 
x 
I 
I 
I 
1 
I 
I 1 
: * { 
i : 
I 
I 
2 
2 j 
; . i 
I 
I 
1 : 
2 
2 
i ! 
j 
2 
1 
1 
I 
l 1 
I 
1 .... 
I 1 
1 
I 
1 
2 
2 ' 
j 
I 
t 
I 
1 - 
j 1 
J 
I 
I 
1 ! . 
I 
1 
! X 
i. . . . 
I 
I 
I 
I 
I 
! 
I 
3 
I 
2 
1 
I 
i. * . 
2 
; 1 
1 
I 
I : 
1 
1 
I 
I 
2 
1 
1 
I 
2 
i 
I ; 
1 
2 
I 
1 
I | 
L.. 
I 
I 
1 
1 1 
1 
i 
Part of ear infested 
or injured. 
0» 
Ill 
a * 
■T 3 *-> 
! <U 4> 
“ O 
05 JO 
■SE 
s 8 
Peduncle. 
Husk. 
m 
4 
0 
Grain. j 
Total grains on t 
Grains destroyed 
Grain destructi 
to the corn e 
tJ 3 
S & 
gi 
•oW 
i) 
|5 
U c 
ox 
+ 
4- 
+ 
4 - 
4- 
\ 
280 
121 
79 
42 
4 * 
4* I 
4- 
4 - 
4- 
184 
69 
37 
1 32 
+ 
4- j 
i + 
4 - 
4- 
273 
37 
16 
21 
0 
4- ! 
! + 
0 
+ 
344 
no i 
no 
0 
0 
4 - 
1 4 - 
0 
4- 
264 
S 3 1 
28 
25 
+ 
+ 
4 - 
4 - 
4- 
192 
32 j 
26 
6 
+ 
4 -! 
+ 
0 
4 - 
312 
4 1 
41 1 
f 0 
+ 
4- j 
4 * 
4 - 
4- 
256 
62 | 
24 ! 
1 38 
0 
4- 
4- 
4 - 
4- 
280 
55 | 
ss 
0 
0 
4- ! 
4- 
0 
4- 
176 
36 | 
0 
36 
+ 
4- i 
4- 
0 
4- 
240 
28 i 
14 
14 
+ 
4- 
4- 
0 
4- 
288 
ri 3 i 
93 
20 
+ 
4- 
4- 
4 - 
4- 
216 
40 1 
10 
30 
■ + 
+ 
4- 
4 - 
4- 
288 
36 1 
0 
36 
+ 
4 - 
4* 
0 
4 - 
304 
37 
37 
0 
+ 
4- 
4- 
0 
4- 
240 
56 
56 
0 
+ 
4- 
4- 
0 
4 - 
376 
32 
32 
0 
4- 
4- j 
4- 
0 
+ 
200 
20 
20 
0 
+ 
4- ! 
4- 
4 - 
4- 
332 
53 
26 
27 
0 
4 - | 
4- 
0 
4- 
256 
23 
23 
0 
+ 
4- 
4- 
4 - 
4- 
256 
36 
26 
10 
0 
4- 
4- 
4 - 
4 - 
316 
40 
26 
14 
+ 
4- 
4- 
4 - 
4- 
280 
44 j 
31 
13 
+ 
4- 
4- 
0 
4 - 
240 
65 1 
21 
44 
0 
4 - 
4 - 
4 - 
4- 
160 
70 | 
52 
18 
0 
4* 
4 - 
4 - 
4- 
248 
3 i 
0 
3 
0 
4* 
4 - 
0 
4- 
272 
61 | 
36 
25 
+ 
4- 
4- 
4 - 
4- 
312 
40 | 
0 
40 
4- 
4- ! 
4 - 
4 - 
4- 
272 
74 
581 
16 
0 
+ I 
+ 
0 
4- 
312 
40 j 
40 
0 
+ 
+ 1 
1 4- 
0 
4- 
240 
64 j 
22 
42 
+ 
4- j 
4- 
0 
4- 
3°4 
57 j 
47 
10 
0 
4- 
+ 
0 
4- 
160 
4 ! 
1 0 
41 
4- 
4- 
4- 
0 
4- 
262 
4X> 
41 
0 
4- 
4- 
4- 
4 - 
4- 
304 
55 ! 
55 
0 
4- 
4- ! 
1 + 
0 
4- 
352 
19 i 
0 
19 
4- 
4- ! 
1 4- 
4 - 
4- 
288 
| 
0 
13 
4- 
4- 
j 4- 
0 
4 - 
328 
66 
43 
23 
4- 
4- 
4 - 
4 - 
4 - 
192 
Si 1 
I ° 
51 
4* 
4- 
1 4- 
4 - 
4 - 
320 
13 | 
1 0 
13 
4- 
4- i 
1 + 
0 
4- 
232 
18 
! 18 1 
1 0 
4- 
4- 
4- 
0 
4- 
240 
86 | 
S 0 
j 86 
4 - 
4 - : 
+ 
0 
4- 
344 
97 
1 97 i 
0 
4- 
4- 
+ 
0 
4- 
280 
76 
1 59 
i 17 
4- 
4- 
! 4- 
0 
4- 
336 
40 
1 20 
| 20 
4- 
4- 
1 + 
0 
4- 
280 
45 
l 0 
i 45 
4- 
4- 
| 4* 
0 
+ 
232 
47 
1 20 
1 37 
4- 
4- 
+ 
4 - 
4- 
264 
64 
! O : 
! 64 
4- 
4- 
! 4 - 
0 
4- 
304 
35 
! 35 
0 
4- 
4- 
i + 
4 - 
4- 
208 
67 
i 
j 
1 so 
t 
Per cent of kernels destroyed by both species.per cent.. 18. 9 
Injury attributed to European com borer (40 per cent of total damage)..do- 7. 72 
Injury attributed to com earworm (60 per cent of total damage).do- 11.18 
Per cent of ears infested: 
By either species.do- 100 
By both species.do- 82 
By European corn borer.do- 96 
By com earworm.do- 86 
Average number of com earworms per ear. 1. 36 
Average number of European com borers per ear. 3. *4 
Per cent of stalks infested (10 stalks).per cent.. 100 
Infestation per stalk (excluding ears): 
Greatest..larvae.. 23 
Least.do- 4 
Average..do- n. 1 
