June, '22 mclaine: spread European corn borer 229 



The season of 1921 was unusual in several respects, the continued hot 

 dry weather in June and July caused 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 completed by October 3d. During 

 this period one hundred and ninety-seven townships 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 townships 

 infested 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 m.iles infested in 1920, m.akes a total of 7,690 square miles 

 now infested by the European Com Borer in this district. 



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

 Oakland, Brantford, Biurford, and Onondaga in the county of Brant; 

 the seven townships in Elgin county; Gosfield South, Mersea and 

 Pelee Island in Essex coimty; nine out of ten townships in Haldim.and 

 coimty, the tenth township was not scouted on account of the sm.all 

 amount of com grown, but was included in the quarantine; Goderich, 

 Hay, Stephen, Tuckersmith and Usbome in Huron county; Gore of 

 Camden, Harwich, Howard, Orford, Raleigh, Romney, Tilbury East 

 and Zone in Kent county; Brooke, Euphemia and Warwick in Lam_b- 

 ton coimty; Clinton, Grantham, Louth and Niagara in Lincoln county; 

 the fifteen townships in Middlesex county ; the eight townships in Nor- 

 folk county; Pickering in Ontario county; the eleven townships in 

 Oxford county; Blanshard, Downie, Easthope North, Easthope South, 

 Ellice, Fullerton, Hibbert, Logan and Momington in Perth 

 county; Waterloo, 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 favour- 

 able one for the European com borer, for there has been a general spread 

 from practically all points of the 1920 area, but the m.ost noticeable 

 spread has been north, northeast and east. 



The scouting work of 1920 showed that there were two distinct in- 

 festations in the province at that 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 larvae in the 

 townships adjacent to the western end of the old Welland infestation, 

 and in townships adjacent to the eastern end of the Middlesex and 



