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Cumulative temperature requirements and development thresholds in two populations of Dicyphus hesperus (Hemiptera: Miridae)1

  • David R. Gillespie (a1), J. Antonio Sanchez Sanchez (a2) and R.R. McGregor (a3)
Abstract
Abstract

Cumulative temperature requirements and development thresholds were determined for two populations of Dicyphus hesperus Knight, 1943 to compare their suitability for use in biological control in greenhouse vegetable crops. The populations were from near Summerland, British Columbia, Canada (49°36′N, 119°40′W, at 334 m elevation) and from near Woody, California, United States of America (35°42′N, 118°50′W, at 500 m elevation). Eggs of the California (CA) population had a higher cumulative temperature requirement for hatch than those of the British Columbia (BC) population. Males of the CA population had a slightly lower cumulative temperature requirement for development from hatch to adult than males of the BC population. The populations did not differ with respect to development thresholds. Males of the CA population experienced higher mortality during development at 35 °C than BC males or females of either population. Males and females of both populations developing at 35 °C were significantly smaller than those developing at more moderate temperatures. The differences between populations with respect to development were biologically trivial. With respect to the effects of temperature on development time under greenhouse conditions, the two populations appear to be equally suitable for use in greenhouses.

Résumé

On a déterminé les conditions de températures accumulées et les seuils de développement de deux populations de Dicyphus hesperus Knight, 1943 afin de comparer la pertinence d'utilizer ces dernières pour la lutte biologique des cultures de légumes de serre. Les populations provenaient des environs de Summerland, en Colombie-Britannique, au Canada (49°36′N, 119°40′O à 334 m d'altitude), et des environs de Woody, en Californie, aux États-Unis (35°42′N, 118°50′O à 500 m d'altitude). Les conditions de températures accumulées des œufs de la population californienne étaient plus élevées que celles de la population de la Colombie-Britannique. Les mâles de la population californienne ont présenté des conditions de températures accumulées légèrement inférieures à celles des mâles de la population de la Colombie-Britannique. Les seuils de développement des deux populations étaient identiques. Les mâles de la population californienne ont présenté un taux de mortalité plus élevé durant leur développement à 35 °C que les mâles de la Colombie-Britannique ou que les femelles de l'une ou l'autre population. Les mâles et les femelles des deux populations qui se sont développés à 35 °C étaient beaucoup plus petits que ceux s'étant développés à des températures modérées. Les différences existant entre les populations en ce qui a trait au développement étaient négligeables sur le plan biologique. Du point de vue de l'effet des températures sur le temps de développement en serre, les deux populations semblent convenir également aux fins d'utilization en serre.

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2Corresponding author (e-mail: gillespied@agr.gc.ca).
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Publication 658 of the Pacific Agri-Food Research Centre.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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