PEOGEESS EEPOET OX THE EUROPEAN COEX BORER 
47 
territory where the insect has become numerous. The decrease in 
aggregate acreage in 1922, as compared to 1921, was approximately 
50 per cent in the -10 towns. 
New York 
The extent of injury and economic loss caused by the corn borer 
in New York State has been comparatively slight to date. Except 
in a very few fields the infestation has not approached that existing 
in New England. 
EASTERX NEW YORK 
Table 7 gives data relative to the injury and loss to ears, grain, and 
stalks of flint, dent, and sweet corn, during the period from 1920 
to 1922, in that portion of the eastern New York area where the 
corn borer is known to have been present for at least four years 
and where it has become fairly well established, although it is prob- 
ably not now as numerous in this area as may be expected in the 
future. Some of the smaller fields representing the maximum in- 
festation in this area are not included in the table. 
Table 7. — Extent of injury and loss caused oy the European com oorer to 
ears, grain, and stalks of field and sweet com in eastern New York, 1920 
to 1922 
Acreage 
of fields 
Locality (eastern examined 
New York) 
1920 1921 1922 
Ear examination 
Number 
examined 
Per cent 
infested 
1920 1921 1922 1920 1921 1922 
Per cent of 
grain injured 
or destroyed 
on ears ex- 
amined 
1920 1921 1922 
Stalk examination 
Number 
examined 
Per cent 
infested 
1920 1921 1922 1920 19211922 
Flint corn: 
Glenville. 
Do._. 
Dent corn: 
Glenville. 
Do— 
Do- 
Sweet corn: 2 
Glenville. 
Do— 
Do— 
Do— 
1 1.63 - 
14.0 
3.0 
4,572 
300 0. 86 
823 
2.00 
1.75 
2.50 
4.00 
157 
. 62 a 00 
1. 10 6. 00 
0.33 
1.90 
.64 
100 . — 15.00 9.00 
250 .... 3. 00 8. 00 
— _L— 2.00' — . 
2.00— 
0.05 
0.00 
02 
1,000 
1,000 
S, 409 
400 
200 
300 
5, 074 
678 
LOCO 
1,300 
500 
11.8 
6.5 
1, 000 
11.7 
2.5 
1.7 
7.5 
10.1 
7.4 
Flint 
Dent 
Sweet 
Three-year average (per cent) : 
Ear infestation — _ '. . 
0.98 
.044 
5.09 
1.03 
.081 
7.75 
5.46 
Grain injury.. _ _______ ... _ ... 
.628 
Stalk infestation,. ...... 
7.79 
1 Experimental plat records. 
2 At roastiDg-ear stage of growth. 
An examination of Table 7 shows that in eastern New York the 
corn borer as yet has caused but a very slight crop loss. Such in- 
festation and loss as have occurred, however, indicate that in this 
area the three types of corn (flint, dent, and sweet) are equally 
susceptible. In the majority of the infested fields of this area 
the infestation is very sparse at present, and in many of these 
fields it is difficult to detect the presence of the insect. 
Comparative counts of stalk infestation which were made during 
1921 and 1922 in 12 average fields located within that portion 
of this area where the corn borer has become well established 
