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MONITORING FOR RESISTANCE TO ORGANOPHOSPHORUS, CARBAMATE, AND PYRETHROID INSECTICIDES IN THE ORIENTAL FRUIT MOTH (LEPIDOPTERA: TORTRICIDAE)

  • L.H.B. Kanga (a1), D.J. Pree (a1), J.L. van Lier (a1) and G.M. Walker (a2)

Abstract

Development of resistance to organophosphorus and carbamate insecticides by the Oriental fruit moth, Grapholita molesta (Busck), has caused great concern regarding the sustainability of peach production in Ontario, Canada. Thus, a resistance management program was implemented and a procedure was developed to monitor for resistance to insecticides in adult moths. Diagnostic concentrations needed to distinguish susceptible genotypes from resistant individuals were determined to be carbofuran (0.1 μg per vial), carbaryl (1.0 μg per vial), malathion (0.5 μg per vial), and cypermethrin (2.5 μg per vial). Significant survival of field-collected moths to diagnostic concentrations of cypermethrin suggested that resistance to pyrethroids might be widespread. The seasonal patterns of resistance of several Oriental fruit moth populations from the Niagara Peninsula of Ontario indicated a decrease in frequencies of resistance to all insecticides tested from 1996 through 1998. Resistance levels were unstable, thus suggesting that resistance could be successfully managed. Our data confirmed the usefulness of the vial test to monitor for resistance to insecticides in the adult Oriental fruit moth, and provided the basis for the development of a resistance management strategy designed to extend the efficacy of all classes of insecticides used for control.

L’apparition des phénomènes de résistance chez la Tordeuse orientale du pêcher, Grapholita molesta (Busck), aux insecticides organophosphorés et carbamates, a engendré des inquiétudes relatives à la production soutenue de pêches à Ontario, Canada. Pour cela, un programme de gestion de la résistance a été mis en place, et une technique pour détecter la résistance au stade imaginal a été développée. Les doses discriminatoires utilisées pour séparer les génotypes sensibles et résistants ont été déterminées comme suit : carbofuran (0,1 μg par fiole), carbaryl (1,0 μg par fiole), malathion (0,5 μg par fiole), et cypermethrine (2,5 μg par fiole). Un pourcentage significatif d’individus testés à la dose discriminatoire de cypermethrine ont survécu, indiquant ainsi que la résistance aux pyréthrinoïdes pourrait être repandue dans la population de cette Tordeuse. Les fluctuations saisonières de la résistance de plusieurs populations de la Tordeuse orientale du pêcher de la Péninsule du Niagara en Ontario, ont révélé une dimunition de la fréquence de la résistance à tous les insecticides testés entre 1996 et 1998. La résistance était instable, par conséquent elle pourrait être gérée. Les données obtenues ont confirmé l’intérêt d’utiliser le test discriminatoire au stade imaginai pour gérer la résistance chez la Tordeuse orientale du pêcher, et ont apporté les éléments de base pour la mise au point de stratégies de gestion de la résistance; lesquelles visent à conserver l’efficacité des toutes les familles d’insecticides utilisées dans les méthodes de lutte.

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References

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MONITORING FOR RESISTANCE TO ORGANOPHOSPHORUS, CARBAMATE, AND PYRETHROID INSECTICIDES IN THE ORIENTAL FRUIT MOTH (LEPIDOPTERA: TORTRICIDAE)

  • L.H.B. Kanga (a1), D.J. Pree (a1), J.L. van Lier (a1) and G.M. Walker (a2)

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