INSECT PEST SURVEY BULLETIN 
Vol. 16 Supplement to No. 9 November 15,1936 
REPORT ON STATUS OP THE EUROPEAN CORN RER in 1936 
By A. M, Vance, Associate Entcmologi: 1 
Division of Cereal and For^. ect Investigations 
Bureau of Sntomol< e b *,ine 
U. S. Department of Jigricul 
The relative abundance of the European corn irer in the fall of 
1936 and its status this year, in comparison Ltb 1935 j were determined 
from a survey conducted fro:.: August 10 to )oto"Der 2 "by the Bureau of Ento- 
mology and Plant Quarantine over a leu ' of the territory infested 
"by the insect. The activity was directed from t Laboratory for European 
corn borer research at Toledo. Ohio, W. A- a r in charge, Ninete n men, 
operating singly, were engaged in the "■:. The survey involved 
approximately 39.1CO miles of* travel and the examination of 2,lUg cornfields, 
taken at random on a county or county-group basis, within a total of 156 
counties in Michigan, Indiana, Ohio, Pennsylvania, New York, Vermont, Maine, 
New Hampshire, Massachusetts, Rhode Island, C 1 iticut, Nov/ Jersey, Delaware, 
Maryland, and Virginia, 
Active cooperation in the survey was given by the Conservation 
Department of Indiana and the State Department of Agriculture in Maine, 
the former surveying three county groups (120 fields) in Indiana, and the 
latter surveying seven counties (lUo fields) in Maine. 
Thoroughly tested field methods, own ti Ly data adequate for 
comparisons between counties and county groups for 1 or more years, were 
employed. Generally, the counties situated in the older infested portion 
of the area were considered separately, and in each a total of 20 random 
fields were surveyed. 
In the more lightly infested se bj is, the counties were combined in 
groups of from two to five, and in each group a total of ^>0 or ho random 
fields were surveyed. The percentage of plan!; Infestation was determined by 
a count of ICO plants in each field, and the average number of borers per 
infested plant was found by a dissection of 10 infested plants in each field 
of a county unit and of 5 infested plants in each field of a county group. 
The accompanying tables, maps, and chert s th status of the 
European corn borer in 1S3^» i n comparison with its abundance in recent 
years, and the following discussion summarizes the situation in 193^* 
U2 5- LIBRARY 
3TATE PLANT BOARD 
