1923 ENTOMOLOGICAL SOCIETY. 11 



The scouting was carried on under the same co-operative scheme which 

 was adopted when this insect was first found in the Province, that is, the work 

 was under the immediate supervision of the Canada Department of Agriculture, 

 but the Ontario Department of Agriculture assisted by delegating four men and 

 two Ford cars for the scouting work. A total of fifteen men and five Ford cars 

 were engaged on the scouting which commenced on July 24th, and was completed 

 September 20th. During this period one hundred and sixty-five townships were 

 carefully examined, and of these forty-five were found to be infested by the 

 European Corn Borer. 



This insect has spread during the past year over Kent, Essex and Lambton 

 counties, and the important corn growing area of Ontario may now be said to be 

 infested by this pest. The infestation in the counties mentioned is, fortunately, 

 extremely "light," and up to the present time no actual damage has resulted 

 to the corn crop in these areas, although the same cannot be said for the "heavily" 

 infested districts in Elgin and Middlesex counties. In 1921 a single township 

 (Pickering) was found infested on the north shore of Lake Ontario, but the scout- 

 ing carried on during the past summer adds nine additional townships to the 

 infested area. The greater portion of these have undoubtedly been infested 

 by the natural dispersion of the insect, but the cause of infestation in two town- 

 ships (Clarke and Brighton) at least, is unknown. The infestations in these 

 counties were very light and isolated, and may possibly have been due to import- 

 ing infested corn or corn stalks. 



There was very little spread of this insect in a northerly or northeasterly 

 direction, which may be due to the fact that there is comparatively little corn 

 grown in this area. In addition the infestation found in the northern territory 

 in 1921 was very slight. 



The area known to be infested by the European Corn Borer up to October 

 1922 is as follows: 



The entire county of Brant, Elgin, Essex, Haldimand, Kent, Lambton, 

 Middlesex, Norfolk, Oxford, Perth, Waterloo, and Welland; and the following 

 townships, Culross in Bruce county, Clarke in Durham county; Trafalgar in 

 Halton county; all but Ashfield, Wawanosh East, Wawanosh West and Howick 

 in Huron county; all but Caistor in Lincoln county; Brighton in Northumber- 

 land county; Pickering, Whitby East and Whitby West in Ontario County; 

 Albion, Chinguacousy, and Toronto in Peel county; Guelph in Wellington county; 

 Ancaster, Barton, Flamborough East and Flamborough West in Wentworth 

 county; and York and Scarborough in York "county. A total of one hundred 

 and fifty-two townships covering approximately eleven thousand seven hundred 

 and eleven miles is represented by the above area. 



The following table indicates the spread of the European Corn Borer in 

 southern Ontario since its discovery in 1920, together with the number of town- 

 ships and square miles infested up to October, 1922: 



Year 



Townships Infested 



Square Miles Infested 



1920.. 





35 



65 



7 



45 



2,780 



1921 



1922* 



1922 



4,910 



524 



3,497 





152 



11,711 



*Seven townships were added to the quarantined area in February, 1922, in order to provide 

 markets and straighten the quarantine line. 



