PROGRESS REPORT ON THE EUROPEAN CORN BORER 
147 
SUPPLEMENT 
In addition to the material presented in this bulletin, it seems de- 
sirable to summarize a few of the more important recent develop- 
ments which have occurred since the manuscript was prepared. 
The following matter therefore has been included as a supplement. 
DISTRIBUTION 
At the close of 1926 the European corn borer had extended its 
range in the middle western portion of the United States to in- 
Fig. A. — Map showing the distribution of the European corn borer as known Novem- 
ber 1, 1926. The outside (darkly sbaded area) indicates the spread of the pest 
which is believed to have occurred during tbe summer of 1926. (Infested area 
in New England not shown.) 
elude the area shown on the accompanying map (fig. A). The 
entrance of the insect into the extensive corn-producing regions of 
Michigan, Ohio, and Indiana is fraught with possibilities of great 
economic losses. Dispersion of the corn borer in New England re- 
cently has been very limited and the area now infested is practically 
the same as indicated in the map included in the body of this 
bulletin. Slight extensions have occurred along the Connecticut 
shore line, on Long Island, and on Staten Island. Two small, inde- 
pendent infestations have been found in the Bayonne and Jersey City 
sections of New Jersey. Since the summer of 1923 the corn-borer 
situation in southern Ontario, Canada, has rapidly grown worse. 
At the close of 1924 the Dominion entomologists reported that com- 
mercial losses occurred in 21 townships located in Oxford, Elgin, 
Middlesex, Kent, and Essex Counties, where the stalk infestation 
varied from 50 to 100 per cent. " In one canning district 25 per cent 
of the contracted acreage was refused at the factory on account of 
