Detection of resistance in the codling moth Cydia pomonella. Insecticides tests on diapausing larvae from Switzerland, Armenia and Bulgaria | Detection de la resistance du carpocapse Cydia pomonella. Tests d'insecticides sur des chenilles diapausantes de Suisse, d'Armenie et de Bulgarie
2007
Charmillot, P.J. | Pasquier, D. | Salamin, C. | Briand, F., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Ther-Hovannesyan, A. | Azizian, A. | Kutinkova, H. | Peeva, P. | Velcheva, N.
Resistance detection tests were carried out by the topical application of discriminating insecticide doses on diapausing larvae of the codling moth C. pomonella collected in Swiss, Armenian and Bulgarian orchards. The level of resistance varied according to the origin of the populations and their history of pesticide treatment. Swiss strains were, in the worst cases, highly resistant to the insect growth regulators fenoxycarb, tebufenozide, methoxyfenozide and diflubenzuron, to deltamethrin as well as to the organophosphates phosalone and azinphos-methyl. They were a little less resistant to chlorpyrifos-methyl and chlorpyrifos-ethyl. Resistance to more recent products such as indoxacarb, imidacloprid, thiacloprid and spinosad was also very pronounced. The two strains coming from Armenia and Bulgaria were highly resistant to the organophosphates and pyrethoids whereas the efficacy of insect growth regulators and of the more recent products was clearly less affected. Only Emamectin, a new insecticide still in development, showed no signs of cross-resistance. The recommended strategy for resistance management, consisting of a combination of mating disruption technique and granulosis virus, improved efficacy of the majority of the products after few years.
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