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1 April 2003 Organophosphorus Insecticides Synergize Pyrethroids in the Resistant Strain of Cotton Bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) from West Africa
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Abstract

Helicoverpa armigera (Hübner) populations from West Africa recently developed resistance to pyrethroid insecticides through enhanced metabolism by mixed-function oxidases. The combination index method was used to study the synergism of pyrethroids by organophosphorus insecticides. Several mixtures of insecticides currently registered to control cotton pest complex in West Africa were tested, including: cypermethrin/ethion, cypermethrin/profenofos, deltamethrin/triazophos, deltamethrin/chlorpyriphos, cyfluthrin/chlorpyriphos, and betacyfluthrin/chlorpyriphos. In the resistant strain, the organophosphorus insecticides significantly increased the toxicity of pyrethroids suppressing the resistance effect, either by additive or synergistic effects. Significant synergism was shown for the following mixtures: cypermethrin/ethion, deltamethrin/triazophos, and deltamethrin/chlorpyriphos. The use of synergism from these insecticide mixtures should prove to be an additional tool in the overall resistance management strategy because the pyrethroid resistance in H. armigera from West Africa is not yet stable, decreasing between cotton seasons and increasing with treatments. In absence of selection, the susceptibility of H. armigera to insecticides should be restored.

Thibaud Martin, Ochou G. Ochou, Maurice Vaissayre, and Didier Fournier "Organophosphorus Insecticides Synergize Pyrethroids in the Resistant Strain of Cotton Bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) from West Africa," Journal of Economic Entomology 96(2), 468-474, (1 April 2003). https://doi.org/10.1603/0022-0493-96.2.468
Received: 12 June 2002; Accepted: 1 October 2002; Published: 1 April 2003
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