Trends in cross-resistance to SDHI fungicides and occurrence of isofetamid resistance in Botrytis cinerea isolates in Mie Prefecture, Japan

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Key Points

The research aims to assess trends in cross-resistance to SDHI fungicides in Botrytis cinerea isolates from Mie Prefecture.
Collected Botrytis cinerea samples from vegetable crops in Mie Prefecture from 2018 to 2021.
Analyzed cross-resistance patterns among the isolates classified into five major patterns (A to E).
Identified mutations in the SdhB gene related to resistance.
Pattern E, showing cross-resistance to all five SDHI fungicides tested, had the highest detection rate.
Detection of isolates displaying the H272Y mutation was observed in resistance patterns D and others.
A trend of increasing SDHI-resistant Botrytis cinerea populations was noted.

This research investigates cross-resistance trends in Botrytis cinerea populations, suggesting increased resistance to SDHI fungicides.

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KAWAKAMI et al. (2026) studied this question.

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