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COMPETITION BETWEEN ORIUS TRISTICOLOR (WHITE) (HEMIPTERA: ANTHOCORIDAE) AND AMBLYSEIUS CUCUMERIS (OUDEMANS) (ACARI: PHYTOSEIIDAE) FEEDING ON FRANKLINIELLA OCCIDENTALIS (PERGANDE) (THYSANOPTERA: THRIPIDAE)1

Published online by Cambridge University Press:  31 May 2012

David R. Gillespie
Affiliation:
Agriculture Canada Research Station, PO Box 1000, Agassiz, British Columbia, Canada V0M 1A0
D.J.M. Quiring
Affiliation:
Agriculture Canada Research Station, PO Box 1000, Agassiz, British Columbia, Canada V0M 1A0

Abstract

The competition between Orius tristicoior (White) and Amblyseius cucumeris (Oude-mans), both preying on western flower thrips, Frankliniella occidentaiis (Pergande), was assessed. On single leaves in smail cages, mortality of A. cucumeris due to O. tristicoior was inversely proportional to thrips density; thrips mortality due to O. tristicoior was unaffected by A. cucumeris density. The proportion of A. cucumeris in the prey eaten was consistently less than its proportion in the prey initially available, both when thrips density varied and when A. cucumeris density varied. These relationships held for both immature and adult thrips. These results suggest that O. tristicoior and A. cucumeris could be used simultaneously for biological control of western flower thrips in greenhouse vegetable crops.

Résumé

La compétition entre Orius tristicoior (White) et Amblyseius cucumeris (Oudemans), tous deux prédateurs du Thrips des petits fruits, Frankliniella occidentaiis (Pergande), a fait l’objet d’une évaluation. Sur des feuilles isolées dans des petites cages, la mortalité d’A. cucumeris causée par O. tristicoior était inversement proportionnelle à la densité des thrips; la mortalité des thrips causée par O. tristicoior n’était pas affectée par la densité des A. cucumeris. La proportion des A. cucumeris consommée était toujours moins élevée que la proportion de ces acariens par rapport au total des proies disponibles au départ, aussi bien lorsque la densité des thrips variait que lorsque la densité des acariens variait. Ces relations prévalaient à la fois dans le cas des thrips immatures et dans le cas des thrips adultes. Ces résultats indiquent qu’O. tristicoior et A. cucumeris peuvent être utilisés simultanément pour assurer le contrôle biologique du Thrips des petits fruits dans les cultures de légumes en serre.

[Traduit par la rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1992

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