48 
BULLETIN 1476, U. S. DEPARTMENT OF AGRICULTURE 
showed 9.3 per cent of stalk infestation in 1921, with an average 
of 2.51 larvae per infested stalk (23.3 larvae per 100 stalks); 
while in 1922 in the same fields 7.9 per cent of the stalks were 
infested, with an average of 2.38 larvae per stalk (18.8 larvae 
per 100 stalks). Figures are not available for the 1923 field survey 
in this area. A comparable survey in 30 of the same or near-by 
fields in 1924 showed an average stalk infestation of 15.1 per cent, 
containing an average of 1.6 larvae per infested stalk (24.2 larvae per 
100 stalks). Examinations of the ear infestation in 8 of these 
sweet-corn fields, included above, showed that an average of 5.3 
per cent of the ears contained the borer in these fields at the time 
of harvest. 
WESTERN NEW YORK 
The injury and loss as well as the degree of infestation have 
been greater in the western than in the eastern area of New York 
State. Table 8 gives data for the period 1920 to 1922 regarding 
infestation and injury to field and sweet-corn fields, selected on the 
basis of personal judgment of average conditions, within the area 
where the corn borer has become well established in western New 
York. Some of the smaller fields which represented the maximum 
infestation of the area are not included in this table. 
Table 8. — Extent of injury and loss caused by the European corn borer to 
ears, grain, and stalks of field and sweet corn in icesteni yew York, 1920 
to 1922 
Ear examination 
Per cent of 
grain injured 
or destroyed 
on ears 
examined 
Stalk examination 
Locality (western 
New York) 
Acreage 01 
fields 
examined 
Number 
examined 
Per cent 
infested 
Number 
examined 
Per cent 
infested 
1920 
1921 
1922 
1920 
1921 
1922 
1920 
1921 
1922 
1920 
1921 
1922 
1920 
1921 
1922 
1920 
1921 
1922 
Flint corn: 
Silver Creek. 
4.00 
3.50 
.25 
To 
6.5 
I6."6 
22.0 
1.5 
6.0 
5.0 
5.0 
2.0 
8.0 
200 
200 
~150 
500 
"500 
1,000 
200 
500 
500 
500 
500 
500 
500 
500 
500 
"~I66 
500 
500 
1,000 
500 
1,000 
200 
1,000 
1,000 
500 
4.4 
Li 
1.9 
1.0 
0.37 
.04 
2.~32 
1.20 
~."07 
.06 
. 11 
.06 
.04 
.12 
.09 
.01 
.00 
.01 
.01 
Tii 
1.01 
.71 
.46 
1.02 
.89 
.09 
1.64 
.04 
.07 
300 
300 
100 
.... 
500 
31 ? 
Dent corn: 
Hanover - 
12.0 
1.5 
22.0 
16."6 
71 
19 
Silver Creek 
Indian reservation 
"150 
1,000 
1,000 
200 
500 
500 
500 
500 
500 
500 
500 
1,000 
"loo 
500 
500 
1,000 
500 
1,000 
200 
1,000 
1,000 
1,000 
.... 
19.7 
99 fi 
Silver Creek 
15 5 
Do 
.4 
13 
Do 
.8 
1.2 
1.4 
.2 
.2 
.6 
.4 
"§."6 
4.2 
1.4 
2.6 
3.2 
2.7 
.5 
5.2 
!4 
1.14 
13 6 
Do 
13 ?, 
Do 
9 6 
Do 
1 4 
Do 
2.0 
2.0 
4.0 
3 6 
Do 
4 ?, 
Do 
3 5 
Sweet corn: 1 
Hanover. _.. 
""l 
5.0 
2.0 
4.0 
1.0 
3.0 
1.0 
5.0 
6.0 
3.0 
100 
45 
Silver Creek 
Do 
78 
16.0 
37 9 
Do 
27 4 
Do 
9Q 1 
Do 
16 4 
Do..... 
22.7 
8 
Do 


Do 
44 9 
Do 
8 9 
Do 
3 5 
Flint 
Dent | 
Sweet 
Three-year average (per cent) : 
4.4 
1.2 
31.2 
1.33 
.06 
14.40 
:i. 18 
Grain injurv . ...... .. ... 
23.90 
1 At roasting-ear stage of growth. 
