I IT SECT PEST SURVEY BULLETIN 
Vol. 16 Supplement to Ho. U June 15, 193& 
RESULTS OF EUROPEAN CORN BORER SURVEYS IN THIRTEEN SELECTED COUNTIES, 1935 
By L. H. Worthley, In Charge, 
Japanese Beetle Control Division, 
Bureau of Entomology and Plant Quarantine, 
U. S. Department of Agriculture. 
Results of a survey to determine the degree of European corn "borer 
infestation over a considerable portion of the infected area were reported 
by A. M. Vance, of the Division of Cereal and Forage Insect Investigations, 
in the Insect Pest Survey Bulletin vol. 15, supplement to no. 9 (October 
1935). 
As a part of a corn "borer survey performed "by men employed under 
Works Progress Administration funds, working under the supervision of the 
Japanese Beetle Control Division, surveys were made in 13 counties in Maine, 
Michigan, New Hampshire, New Jersey, and Vermont that were not covered by the 
survey organized by the Division of Cereal and Forage Insect Investigations. 
In general, the W. P. A. survey was made in fields selected at random 
in each township of the counties covered. Twenty-five consecutive corn 
plants in one row near the center of each quarter of the field were examined 
for infestation, a total of 100 plants being examined in each field. Ton of 
the plants showing infestation were dissected to determine the average 
number of corn borers per infested plant. 
Data concerning the 13 nonduplicated counties supplement that pre- 
viously reported, and are tabulated for the information of interested State 
officials. 
Townships in the respective counties surveyed are listed, together 
with the number of fields examined, acres surveyed, percentage of plants 
found infested, and the average number of corn borers per 100 plants examined. 
County summaries are included. There are, however, no regional averages, as 
these data are incomplete for continuous areas, and must be considered in 
conjunction with previously published results if regional averages arc 
desired. 
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