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  • Paul G. Fields (a1) and Jeremy N. McNeil (a1)


The true armyworm, Pseudaletia unipuncta (Haw.), has no evident diapausing stage, is not freeze tolerant, shows no consistent seasonal changes in either supercooling-point values or longevity at 0 °C for different developmental stages, and did not survive when held in overwintering cages in the field. These facts support the hypothesis that this species cannot overwinter in Quebec and that the adult populations observed each spring must therefore be the result of a northerly migration from sites, such as Tennessee, where overwintering is known to occur.

Chez la légionnaire uniponctuée, Pseudaletia unipuncta (Haw.), il n'y a pas de stade diapausant et elle ne possède pas la capacité à tolérer le gel. De plus il n'y a pas, chez les différents stades de développement, de changements saisonniers consistants dans le point de sur-refroidissement ou dans le longévité à 0 °C. Enfin, elle ne survie pas pendant l'hiver dans les cages sur le terrain. Ces faits supportent l'hypothèse que la légionnaire ne puisse passer l'hiver au Québec et que les populations d'adultes qui surgissent à chaque printemps doivent nécessairement être le résultat d'une migration en direction du nord à partir de régions, comme le Tennessee, où il est connu que l'hivernement a lieu.



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  • Paul G. Fields (a1) and Jeremy N. McNeil (a1)


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