Moth density and oviposition patterns of the European corn borer, Ostrinia nubilalis (Lepidoptera: Pyralidae), in Alberta
1988
Lee, D.A.
Density patterns of moths and egg masses of the European corn borer, Ostrinia nubilalis (Hubner), in southeastern Alberta were compared to those previously determined for populations in Iowa and New York. In Alberta, significantly more moths were caught in pheromone traps in the center of corn fields than at field borders. More moths were flushed and more egg masses counted in plants in the field center than on those near field edges. Distribution of egg masses was clumped, likely because of differential attractivenes of plants. Numbers of egg masses increased as corn stand density increased. However, in Iowa, moths aggregate in weeds outside the cornfield, and in New York, egg masses are randomly distributed. These differences in moth and egg distribution are related to differences in climate and native vegetation between regions. In arid southeastern Alberta, stands of tall, dense weeds are unavailable outside irrigated cornfields.
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