Ametocrradin - Non-elaborate - Resistance Genetic Mutations - Posts 1



 In Phytophthora sojae, point mutation S33L in the mitochondrial Cytb gene confers strong resistance, albeit with fitness penalties. Notably, resistant mutants showed negative cross-resistance to amisulbrom, helping inform management strategies. Additionally, no cross-resistance with other fungicide classes was observed, which is encouraging for rotation schemes. Limited cases of resistance in Plasmopara viticola (grape downy mildew), notably S34L mutation and non-target-site resistance via alternative oxidase overexpression. Recommendations: apply preventatively, limit to a maximum of 3 applications per season, always tank-mix or rotate with fungicides of differing modes of action


(To be revised and added to)

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