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EFFECTS OF PESTICIDE USE ON SPIDERS (ARANEAE) IN QUEBEC APPLE ORCHARDS1

  • Noubar J. Bostanian (a1), Charles D. Dondale (a2), Michael R. Binns (a3) and Donat Pitre (a1)

Abstract

In Quebec commercial apple orchards, spider populations are shown to have been depressed numerically by current pest management practices. Hunting species appeared to be more sensitive to insecticides than web-building species. There were large differences in spider distribution among orchards and years, although some consistent patterns were observed. Specimens from the following families were captured: Theridiidae, Linyphiidae, Lycosidae, Araneidae, Erigonidae, Clubionidae, Tetragnathidae, Dictynidae, Salticidae, Philodromidae, and Thomisidae. In orchards treated only for scab control or with only a single insecticide application for apple maggot control, spiders attained their maximal numbers in August. With two treatments for apple maggot control, spiders attained their maximal numbers towards the end of September.

Les populations d'araignées dans des vergers commerciaux du Québec ont été réduites par les traitements de répression des ravageurs d'usage courant. Les espèces errantes ont démontré une plus haute sensibilité aux traitements insecticides, comparativement aux araignées à toile. Leurs densités dans les vergers et dans le temps différaient considérablement, néanmoins certains modèles de distributions ont été observés. Nous avons répertorié des espèces appartenant aux familles suivantes : Theridiidae, Linyphiidae, Lycosidae, Araneidae, Erigonidae, Clubionidae, Tetragnathidae, Dictynidae, Salticidae, Philodromidae et Thomisidae. Dans les vergers pulvérisés uniquement contre la tavelure ou ayant reçu un seul traitement contre la mouche de la pomme, la population d'araignées a été la plus dense en août. Avec deux traitements contre la mouche de la pomme, les araignées atteignirent leurs nombres maxima vers la fin de septembre.

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EFFECTS OF PESTICIDE USE ON SPIDERS (ARANEAE) IN QUEBEC APPLE ORCHARDS1

  • Noubar J. Bostanian (a1), Charles D. Dondale (a2), Michael R. Binns (a3) and Donat Pitre (a1)

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