Manejo de Pissodes strobi (Coleoptera, Curculionidae) en bosques de Pinus banksiana en Ontario, Canadá: factores de mortalidad de la plaga y selección de microhabitat por mamíferos predadores

Authors

  • M. Isabel Bellocq Faculty of Forestry, University of Toronto, 33 Willcocks St., Toronto, Ontario, Canada MSS 3B3
  • Sandy M. Smith Faculty of Forestry, University of Toronto, 33 Willcocks St., Toronto, Ontario, Canada MSS 3B3

Abstract

The white pine weevil, Pissodes strobi Peck, is a serious pest of young Jack pine (Pinus banksiana) plantations in northern Ontario, Canada. This study was conducted to assess pest mortality caused by mammals, birds, and insects in planted and seeded Jack pine, and to examine microhabitat selection by the masked shrew (Sorex cinereus), predator of weevils, in order to develop recommendations for management of the pest and its natural enemies. Total overwintering mortality of adult weevils was higher in the planted (92%) than in the seeded (78%) stand. There was no significant difference in mortality caused by other factors between the planted and seeded stands. Small mammals took an average of 12% of the adult weevil population during the winter. Birds killed 8% of the late larvae and pupae of weevils while insect predatorsparasitoids (inverse density-dependent mortality) and crowding of pupae (direct density-dependent mortality) destroyed 48 % of the larvae and pupae population. The masked shrew selected microhabitat with high coverage of herbaceous dicots, logs, and low shrubs, and leaf litter as substrate. Appropriate management strategies of the forest to increase mortality of P. strobi should include 1) leaving mature stands surrounding young plantations to provide nest sites for cavity nesters; 2) leaving fallen logs and snags in the process of site preparation to encourage mammalian predators; 3) reducing herbicide applications; and 4) destroying overwintering sites.

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Published

1995-06-01

How to Cite

Bellocq, M. I., & Smith, S. M. (1995). Manejo de Pissodes strobi (Coleoptera, Curculionidae) en bosques de Pinus banksiana en Ontario, Canadá: factores de mortalidad de la plaga y selección de microhabitat por mamíferos predadores. Ecología Austral, 5(1), 011–020. Retrieved from https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1678

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Vol. 5 No. 1 (1995)

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