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Life history of a secondary bark beetle, Pseudips mexicanus (Coleoptera: Curculionidae: Scolytinae), in lodgepole pine in British Columbia

  • G.D. Smith (a1), A.L. Carroll (a1) and B.S. Lindgren (a2)


Pseudips mexicanus (Hopkins) is a secondary bark beetle native to western North and Central America that attacks most species of pine (Pinus L. (Pinaceae)) within its range. A pair of life-history studies examined P. mexicanus in other host species, but until now, no work has been conducted on lodgepole pine (Pinus contorta Douglas ex Louden var. latifolia Engelm. ex S. Watson). Pseudips mexicanus in lodgepole pine was found to be polygynous. Galleries were shorter, offspring smaller, and the eggs laid per niche and the potential progeny fewer than in populations from California and Guatemala. Development from the time of female attack to emergence of adult offspring took less than 50 days at 26.5 °C, and the accumulated heat required to complete the life cycle was determined to be 889.2 degree days above 8.5 °C, indicating that in the northern portion of its range P. mexicanus is univoltine. Determination of these life-history traits will facilitate study of interactions between P. mexicanus and other bark beetle associates in lodgepole pine.

Pseudips mexicanus (Hopkins) est un scolyte de l’écorce secondaire, indigène de l’ouest de l’Amérique du Nord et de l’Amérique centrale, qui attaque la plupart des espèces de pins (Pinus L. (Pinaceae)) dans son aire de répartition. Deux études ont examiné le cycle biologique de P. mexicanus chez d’autres espèces d’hôtes, mais à ce jour, aucun travail n’a été réalisé sur le pin tordu (Pinus contorta Douglas ex Louden var. latifolia Engelm. ex S. Watson). Pseudips mexicanus est polygyne sur le pin tordu. Les galeries sont plus courtes, les rejetons plus petits, et les oeufs pondus par niche et la progéniture potentielle moins nombreux que dans les populations de Californie et du Guatemala. Le développement depuis l’attaque des femelles jusqu’à l’émergence des rejetons adultes prend moins de 50 jours à 26,5 °C et la chaleur accumulée nécessaire pour compléter le cycle biologique est estimée à 889,2 degrés-jours au-dessus de 8,5 °C, ce qui indique que P. mexicanus est univoltin dans la partie nord de son aire de répartition. La détermination de ces traits du cycle biologique facilitera l’étude des interactions entre P. mexicanus et les autres scolytes de l’écorce qui lui sont associés sur le pin tordu.

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Life history of a secondary bark beetle, Pseudips mexicanus (Coleoptera: Curculionidae: Scolytinae), in lodgepole pine in British Columbia

  • G.D. Smith (a1), A.L. Carroll (a1) and B.S. Lindgren (a2)


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