KEPORT OF THE SOCIETY 



51 



An examination of the areas infested by the corn borer in the United States 

 and Canada and the conditions accompanying each area suggests at least four 

 centres of infestation : Massachusetts, New York (eastern), New York (western) 

 and the St Thomas district in Ontario. The 1921 results would indicate that 

 lake shore conditions are very favorable for the spread of the insect, as collec- 

 tions were made in practically all townships surrounding Lake Erie. This may 

 be due to any one of several factors including water currents into which infested 

 corn refuse has found its way, wind currents with adults in flight, and shipping 

 transportation 



The importance of the European Corn Borer as a pest is recognized by all 

 who have seen the results of its work Every effort, both in the United States 



Map showing areas infested in black. 



and in Canada, is being made to reduce its spread to the minimum and to devise 

 the best methods for treating infested areas. Quarantines have been placed on 

 the infested townships in both countries which prevent the removal to outside 

 areas of products liable to harbor the borer . . . Control measures of importance 

 have been recommended bj^ the Dominion and Provincial Departments of 

 Agriculture in circulars distributed amongst the growers in the infested districts 

 in Ontario. These control measures include planting as late as is safe, early and 

 low cutting of corn, ensiling the crop, early and careful ploughing of stubble 

 fields followed by rolling and the proper disposal of all refuse corn stalks, weeds, 

 etc., about the premises before the first of June. 



Investigations will be continued in Ontario again this season and an effort 

 will be made to test the value of the above control measures by an organized 

 campaign in a definite area of the most heavily infested district. 



The gradual spread of the corn borer is naturally to be expected but the 

 value of the quarantine in preventing the wholesale shipment of infested pro- 



