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Communication dans un congrès

A new isolate overcoming Cydia pomonella resistance to Granulovirus: improvement of its efficiency by selection pressure on resistant hosts

Abstract : Since 2004, some codling moth (Cydia pomonella) populations resistant to the Mexican isolate of Cydia pomonella granulovirus (CpGV-M) were detected in different organic orchards in Western Europe. A resistant laboratory colony of codling moth (RGV) was built by introgression of the resistance character in a susceptible laboratory colony (Sv). The resistance of the RGV colony to the CpGV-M came over 60,000-fold when compared to the susceptible laboratory colony (to Sv). To overcome this resistance, the efficiency of CpGV isolates from various origins was investigated. Two of them (I12 and NPP-R1) presented an increased activity on RGV larvae. NPP-R1 reduces the resistance factors of RGV to 7-fold and 46-fold at the LC50 and LC90. Genetic characterization showed that NPP-R1 is a mixture of at least two prevalent genotypes, one of them being similar to CpGV-M. The 2016-r8 isolate obtained from eight cycles of selection of NPP-R1 on RGV larvae had a sharply reduced proportion in the CpGV-M genotype and an increased efficiency on RGV. Carpovirusine samples were formulated with these isolates for field experiment. Results from Germany, Italy and France gave promising results, showing that the 2016-r8 isolate is a good candidate to control CpGVM resistant codling moth populations.
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Communication dans un congrès
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https://hal.inrae.fr/hal-02758508
Déposant : Migration Prodinra <>
Soumis le : jeudi 4 juin 2020 - 03:47:52
Dernière modification le : lundi 31 août 2020 - 18:05:54

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  • HAL Id : hal-02758508, version 1
  • PRODINRA : 45356

Citation

Marie Berling, Christine Blachère-Lopez, Olivier Soubabère, Jean-Baptiste Rey, Sophie-Joy Ondet, et al.. A new isolate overcoming Cydia pomonella resistance to Granulovirus: improvement of its efficiency by selection pressure on resistant hosts. 7 International Conference on Integrated Fruit Production, Oct 2008, Avignon, France. ⟨hal-02758508⟩

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