REPORT OF THE SOCIETY 53 



were infested by the borers. Dent corn does not appear to be as readily attacked 

 as flint, as the highest percentage of infestation found in a field of dent corn was 

 forty-five. Intensive investigations were started soon after the borer was 

 found, to determine the amount of actual damage done by the pest. These are 

 still being carried out by Mr. H. G. Crawford, of the Division of field crop and 

 garden insects, who has immediate charge of the work, and the final results have 

 not yet been compiled. 



The United States officials are strongly of the opinion that the European 

 Corn Borer was introduced into the United States on shipments of broom corn 

 imported from 1909-1912. This was substantiated by a shipment of broom 

 corn being received at the port of New York from Italy, during the spring of 

 1920, heavily infested with borers; Enquiries conducted by the Entomological 

 Branch, have shown that in 1909 the largest corn broom factory in Canada was 

 operating in the St. Thomas district. Between 1909-1911 hundreds of tons of 

 broom corn were imported from central Europe by this firm, on account of the 

 shortage of broom corn in the southern United States. Although this evidence 

 can by no means be regarded as conclusive, nevertheless it is the most important 

 that has been obtained to date. 



In order to prevent the spread of the borer by artificial means, an embargo 

 was passed on November 29th, 1920, which prohibits the movement of corn 

 fodder or corn stalks, including broom corn, whether used for packing or other 

 purposes, green sweet corn, roasting ears, corn on the cob or corn cobs from the 

 areas infested by the European corn borer. Five exceptions are made to this 

 Quarantine, the two chief ones being that it shall not apply to clean shelled 

 corn or clean seed of broom corn, and the second permits the forwarding of seed 

 corn on the cob to exhibitions of recognized standing, such exhibits are 

 examined at point of destination by an authorized inspector. 



