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The Status of the European Corn Borer in Ontario (1925)

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During the season of 1925 the European Corn Borer, Pymusta nubilalis, in Ontario extended its range outside the quarantine area of the year (227 townships) by 25 townships. These form two major extensions. One of eleven townships in a north and easterly direction from the main body of the infested area, and a second of fourteen townships, an eastward extension along Lake Ontario and the St. Lawrence River to Brockville. The intensity of the infestation throughout the Province increased in general, though a marked decrease took place in the neighborhood of Union in the centre of what was formerly (1923) the most intensely infested locality. The increase in the Counties of Essex and Kent was most marked, the crop throughout at least 400 square miles was completely ruined. Here average stalk populations by fields reached as high as 39 larvae at the end of the season, and in some fields every cob was infested and 84 per cent of the cobs were seriously checked in their development. The prospects are for continued increase of approximately the same magnitude in 1926. Control measures are being adopted very slowly by the farmers, and promised legislative action is awaited by the growers before they seriously attempt to grapple with the problem.

Document Type: Research Article

Publication date: February 1, 1926

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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