28 THE EEPOET OF THE No. 36 



Welland infestation, and in townships adjacent to the eastern end of the Middle- 

 sex and Elgin infestation, whereas great difficulty was encountered in locating 

 borers in the centre townships, that is, between the two infestations. 



The infestation is exceedingly light on the extreme western edge of the infested 

 area, that is, in Kent and Essex counties, in fact the only collections in the town- 

 ships found infested in these counties this year, were taken along the (main high- 

 way which runs east and west. The spread into this area may be due to artificial 

 spread, either from carriers such as automobiles, or from infested corn refuse washed 

 up on the shore of the lake, as the highway is adjacent to the lake in this district. 



The discovery of the borer on the Lake Huron shore was ma'de late in the 

 season, and only a single collection of larvae was taken in the township of Gooderich. 

 As the neighboring township was found to be lightly infested, it appears as if the 

 infestation in Goderich township may be due to an exceptionally long flight of the 

 adult moths. 



The only isolated infestation was found in Pickering township, about twenty 

 miles east of Toronto and bordering Lake Ontario. The collection of larvae was 

 made hi the town of Pickering. Although the entire township, as well as the 

 neighboring townships were carefully re-scouted, no further collections were taken 

 The nearest infestation to this point is in Lincoln county approximately forty-five 

 miles away. 



Upon the completion of the scouting season in 1920, a domestic quarantine 

 was placed on the infested area prohibiting the movement of corn stalks, broom 

 corn, green sweet corn, roasting ears, corn on cob and corn cobs from the area 

 place'd under embargo. Exception was made, however, to seed corn on the cob 

 consigned to recognized fairs and exhibition, which were inspected immediately 

 upon arrival at destination. This quarantine was amended in May 1921, and 

 three additional amendments were passecl 'during the summer and early fall, 

 quarantining the additional townships .found infested. 



In order to bring the attention of «the general public to this embargo, warning 

 notices were placed at the intersection of every road leading out of the quarantined 

 area. In addition, large canvas banners 2 l A feet by 11 feet were stretched across 

 the main automobile highways leading out of the district. Automobiles were 

 stopped and searched on the main highways on Sundays and holidays for evasions 

 of the quarantine. A careful watch was also kept on all markets and fall fairs. 

 It was found that live stock men were in the habit of taking corn stalks as fodder 

 for their live stock exhibits at the larger shows, thus making it necessary to 

 station inspectors at such fairs. 



Although no direct evidence has been secured as to the origin of the out- 

 break of the European corn borer, this may have been due in Elgin and Middle- 

 sex counties to importations of broom corn from Europe. From correspondence 

 it has been learned that all Canadian broom manufacturers prefer to use broom 

 corn grown on this continent, but in 1909-10 there was apparently a shortage of 

 this product and one firm at least, located in this district, imported large 

 quantities of corn from Central Europe. 



