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Communication Dans Un Congrès Année : 2021

Resistance of Cydia pomonella to all viral isolates used in biological control in Europe

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Résumé

C.pomonella is a pest of apple and pear present on all continents, against which one of the most effective non-chemical control method is the use of CpGV, a highly specific virus. Since 2004, cases of resistance to the CpGV-M isolate, the only one used since 1992, have been observed. This problem has been overcome by the use of two alternative viral isolates CpGV-R5 and CpGV-V15 which bypass this resistance in Europe. These are actually mixtures of viral genotypes. In 2020, during a resistance monitoring program conducted on 32 wild populations of C.pomonella from European orchards, we detected for the first time populations with multiple resistance to CpGV-M and CpGV-V15. Moreover, 3 populations show resistance to all three isolates, i.e. all isolates used in France to date. The ratio of resistance of these populations to the CpGV-M isolate is over 300, but only around 10 for the two new isolates. This discovery calls into question this alternative control method, and raises the issue of a very rapid evolution of resistance to a bio-pesticide. The sustainability of biopesticides is therefore questioned.
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Dates et versions

hal-03276634 , version 1 (02-07-2021)

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  • HAL Id : hal-03276634 , version 1

Citer

S. Renoult, Bertrand Gauffre, Sandrine Maugin, S. Besse, Miguel Lopez-Ferber, et al.. Resistance of Cydia pomonella to all viral isolates used in biological control in Europe. 2021 International Congress on Invertebrate Pathology and Microbial Control & 53rd Annual Meeting of the Society for Invertebrate Pathology, Jun 2021, Virtual Meeting, France. ⟨hal-03276634⟩
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