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RESISTANCE TO INSECTICIDES IN POPULATIONS OF FRANKUNIELLA OCCIDENTALIS (PERGANDE) (THYSANOPTERA: THRIPIDAE) FROM GREENHOUSES IN THE NIAGARA REGION OF ONTARIO

Published online by Cambridge University Press:  31 May 2012

A.B. Broadbent  and
D.J. Pree
A.B. Broadbent
Affiliation:
Pest Management Research Centre, Agriculture and Agri-Food Canada, 4902 Victoria Avenue North, P.O. Box 6000, Vineland Station, Ontario, Canada L0R 2E0
D.J. Pree
Affiliation:
Pest Management Research Centre, Agriculture and Agri-Food Canada, 4902 Victoria Avenue North, P.O. Box 6000, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

Resistance was documented in 1995 to commonly used organophosphorus, carbamate, and pyrethroid insecticides in populations of western flower thrips, Frankliniella occidentalis (Pergande), from six commercial greenhouses in Ontario. Adult female thrips were placed in glass vials treated with technical-grade insecticides and mortality at 18 h was compared with a single discriminating concentration, the computed LC99 of a reference laboratory population. Baseline dose–response regressions for insecticides commonly used in Ontario greenhouses were obtained for the laboratory population of western flower thrips. The organophosphorus compounds chlorpyrifos and malathion and the carbamates methomyl and bendiocarb were the most toxic materials tested; whereas the pyrethroid deltamethrin and a phosphoroamidate acephate were the least toxic. The addition of piperonyl butoxide to solutions of deltamethrin was highly synergistic. The mixture of deltamethrin and endosulfan (1:1) was moderately synergistic. Populations of western flower thrips from commercial greenhouses were resistant to deltamethrin, but deltamethrin mixed with piperonyl butoxide or endosulfan was synergistic in all cases. None of the populations were resistant to all of the insecticides tested. Recommendations are presented for the development of a resistance-management strategy for western flower thrips.

Résumé

En 1995, la résistance aux insecticides organosphosphorés, carbamates et pyréthroïdes, couramment employés, a été étudiée chez des populations du Thrips des petits fruits, Frankliniella occidentalis (Pergande), dans six serres commerciales en Ontario. Des femelles adultes ont été placées dans des tubes de verre contenant des insecticides en concentrations techniques et la mortalité de ces insectes expérimentaux après 18 heures a été comparée à celle d’une population de référence exposée à une seule concentration discriminante, la concentration LC99 théorique. Des régressions entre la dose de base et la réaction ont été obtenues chez la population de laboratoire de thrips exposés aux insecticides employés couramment dans les serres d’Ontario. Les composés organophosphorés chlorpyrifos et malathion, et les carbamates methomyl et bendiocarbe, se sont avérés les substances les plus toxiques, alors que le composé pyréthroïde deltaméthrine et l’amidophosphate acéphate se sont avérés les moins toxiques. L’addition de butoxyde de pipéronyle aux solutions de deltaméthrine a eu un effet fortement synergiste. Le mélange de deltaméthrine et d’endosulfane (1 : 1) n’était que modérément synergiste. Les populations de thrips des serres commerciales étaient résistantes à la deltaméthrine, mais l’addition de butoxyde de pipéronyle ou d’endosulfane à la delta-méthrine donnait lieu à un mélange synergiste dans tous les cas. Aucune des populations n’était résistante à tous les insecticides. Nous recommandons certains protocoles propres à assurer une bonne stratégie d’aménagement tenant compte de la résistance des thrips.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 5 , October 1997 , pp. 907 - 913
Copyright
Copyright © Entomological Society of Canada 1997

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