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- W4317360560 abstract "Abstract BACKGROUND The prophylactic use of seeds treated with neonicotinoid insecticides remains an important means of controlling aphid pests in canola ( Brassica napus ) crops in many countries. Yet, one of the most economically important aphid species worldwide, the peach potato aphid ( Myzus persicae ), has evolved mechanisms which confer resistance to neonicotinoids, including amplification of the cytochrome P450 gene, CYP6CY3 . While CYP6CY3 amplification has been associated with low‐level resistance to several neonicotinoids in laboratory acute toxicity bioassays, its impact on insecticide efficacy in the field remains unresolved. In this study, we investigated the impact of CYP6CY3 amplification on the ability of M. persicae to survive neonicotinoid exposure under laboratory and semi‐field conditions. RESULTS Three M. persicae clones, possessing different copy numbers of CYP6CY3, were shown to respond differently when exposed to the neonicotinoids, imidacloprid and thiamethoxam, in laboratory bioassays. Two clones, EastNaernup209 and Osborne171, displayed low levels of resistance (3–20‐fold), which is consistent with previous studies. However, in a large‐scale semi‐field trial, both clones showed a surprising ability to survive and reproduce on B. napus seedlings grown from commercial rates of neonicotinoid‐treated seed. In contrast, an insecticide‐susceptible clone, of wild‐type CYP6CY3 copy number, was unable to survive on seedlings treated in the same manner. CONCLUSION Our findings suggest that amplification of CYP6CY3 in M. persicae clones substantially impairs the efficacy of neonicotinoid seed treatments when applied to B. napus. These findings highlight the potentially important real‐world implications of resistances typically considered to be ‘low level’ as defined through laboratory bioassays. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry." @default.
- W4317360560 created "2023-01-19" @default.
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- W4317360560 date "2023-02-02" @default.
- W4317360560 modified "2023-10-16" @default.
- W4317360560 title "<scp>P450</scp>‐mediated resistance in <i>Myzus persicae</i> (Sulzer) (Hemiptera: Aphididae) reduces the efficacy of neonicotinoid seed treatments in <i>Brassica napus</i>" @default.
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- W4317360560 doi "https://doi.org/10.1002/ps.7362" @default.
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