1922 ENTOMOLOGICAL SOCIETY. 37 



that it was exceedingly light, but widely scattered. On August 22nd, a farmer 

 living near St. Thomas, Ontario, submitted some samples of larvee found in his 

 field corn which were readily' identified as caterpillars of the European Corn 

 Borer. A prompt examination of this district showed the degree of infestation to 

 be much greater than that in Welland county. 



With the co-operation of the Ontario Department of Agriculture extensive 

 scouting was started at onee. The extent of the infestations exceeded by far 

 anything that had been anticipated, and as the season was advancing rapidly, 

 the scouting had to be carried on at undue speed. 



At the close of the scouting work it was found that there were two distinct 

 infestations in southern Ontario, the first centering about Welland county, and the 

 second centering about Middlesex and Elgin counties. During the scouting sea- 

 sons one hundred and five townships in thirteen counties were examined, thirty-five 

 of which were found infested by this insect. The area found infested covered ap- 

 proximately 2,780 square miles. 



The season of 19'21 was unusual in several respects, the continued hot dry 

 weather in June and July causing all vegetation to 'develop with abnormal rapidity, 

 and it was necessary to start the scouting work two weeks previously to the time 

 originally planned. The scouting was actually started on August 1st and com- 

 pleted by October 3rd. During this period one hundred and ninety-seven town- 

 ships were scouted, of which sixty-five were found infested; these added to the 

 thirty-five townships found infested in 1920 make a total of one hundred town- 

 ships infeste'd to date. The area found infested by the scouting this past season 

 is approximately 4,910 square miles, which, in addition to the 2,780 square miles 

 infested in 1920, make a total of 7,690 square miles now infested by the European 

 Corn Borer in this district. 



The following townships in Ontario are infested at the present time: Oakland, 

 Brantford, Burford, and Onodaga in the county of Brant ; the seven townships 

 in Elgin county ; Gosfield South, Mersea and Pelee Islan'd in Essex county ; nine 

 out of ten townships in Haldimand county, the tenth township was not scouted on 

 account of the small amount of corn grown, but was included in the Quarantine; 

 Goderich, Hay, Stephen, Tuckersmith and Usborne in Huron county ; Gore of Cam- 

 den. Harwich, Howard, Orford, Baleigh, Eomney, Tilbury East and Zone in Kent 

 county; Brooke, Euphemia and Warwick in Lambton county; Clinton, Grantham, 

 Louth and Niagara in Lincoln county; the fifteen townships of Middlesex county; 

 the eight townships in Norfolk county; Pickering in Ontario county; the eleven 

 townships in Oxford county; Blanshard, Downie, Easthope North, Easthope 

 South, Ellice, Fullerton, Hibbert, Logan and Mornington in Perth county; Water- 

 loo, Wilmot and Woolwich in Waterloo county; the eight townships in Welland 

 county; Guelph in Wellington county; and Lancaster in Wentworth county. 



The degree of infestation is heaviest in Elgin and Middlesex counties, and on 

 the outer edges of the infested area borers were very hard to find. 



It is also to be hoped that the past season was an unusually favorable one for 

 the European corn borer, for there has been a general spread from practically all 

 points of the 1920 area, but the most notieeable spread has been north, northeast 

 and east. 



The scouting work of 1920 showed that there are two distinct infestations 

 in the province at this time, and the results of this past summer's work appear 

 to bear out that conclusion. This season the scouts had no difficulty in making 

 several collections of laTvge in the townships adjacent to the western end of the old 



