Emergence of predator and parasites of the white pine weevil, <i>Pissodes strobi</i> (Coleoptera: Curculionidae), from Engelmann spruce


  • T. J. D. VanderSar Department of Biological Sciences Simon Fraser University Burnaby, B.C.


white pine weevil, <i>Pissodes strobi</i>, Coleoptera, Curculionidae, Engelmann spruce


Adult insects of 13 species emerged from 153 leaders of Engelmann spruce attacked by <i>Pissodes strobi</i> at two British Columbia locations. The most abundant species was the dipteran, <i>Lonchaea corticis</i>, a scavenger and predator of immature <i>P. strobi</i>. The most important primary parasites that attack 4th-instar larvae and pupae were the hymenopterans, <i>Dolichomitus terebrans nubilipennis</i>, <i>Bracon pini</i>, <i>Eurytoma pissodis</i>, and <i>Rhopalicus pulchripennis</i>. Competition for suitable hosts appears greatest between the two last-named species, since females exhibited agonistic behaviour when searching for oviposition sites.


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