Syracuse

Progressive adaptation of a CpGV isolate to codling moth populations resistant to CpGV-M

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Graillot, Benoit | Berling, Marie | Blachère-Lopez, Christine | Siegwart, Myriam | Besse, Samantha | Lopez-Ferber, Miguel

Edité par CCSD ; MDPI -

International audience. The NPP-R1 isolate of CpGV is able to replicate on CpGV-M-resistant codling moths. However, its efficacy is not sufficient to provide acceptable levels of control in natural (orchard) conditions. A laboratory colony derived from resistant codling moths was established, which exhibited a homogeneous genetic background and a resistance level more than 7000 fold. By successive cycles of replication of NPP-R1 in this colony, we observed a progressive increase in efficacy. After 16 cycles (isolate 2016-r16), the efficacy of the virus isolate was equivalent to that of CpGV-M on susceptible insects. This isolate was able to control both CpGV-M-susceptible and CpGV-M-resistant insects with similar efficacy. No reduction in the levels of occlusion body production in susceptible larvae was observed for 2016-r16 compared to CpGV-M.

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