ArticlePest management science2025
The role of selection pressure in shaping zoxamide resistance in Plasmopara viticola populations.
Article in Pest management science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundZoxamide, a β-tubulin inhibitor, is widely used in vineyards to control downy mildew caused by the high-risk pathogen Plasmopara viticola. This study aimed to investigate the selection of zoxamide resistance and its characterization, providing practical insights for resistance management, through a twofold approach: a quantitative assessment of selection pressure effects on oospore populations and the molecular characterization of resistance-associated mutations in P. viticola strains.
resultsA total of 126 populations sampled from 57 vineyards mainly located in North-eastern Italy, were analyzed over a 6-year period (2017-2022). Based on toxicological parameters, 90% of the samples were fully sensitive to zoxamide (EC
conclusionThis study highlighted a low risk of resistance under moderate fungicide application frequencies, indicating the importance of limiting fungicide applications to preserve sensitivity. The genetic diversity of resistance mechanisms, reflected in the various mutations in the β-tubulin gene, underscores the need for a deeper investigation into the fitness of the different genotypes to evaluate resistance spread in P. viticola populations. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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