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Fungicide resistance trends in Australia and New Zealand
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28 April 2026

This chapter evaluates the current state of fungicide resistance in Australia and New Zealand. It also aims to establish trends in fungicide resistance so that resistance in Australia and New Zealand can be better predicted and understood. To accomplish this, the chapter discusses several crop diseases that have become or are developing fungicide resistance, including Botrytis cinerea, Venturia inaequalis, Pyrenophora teres spp., Zymoseptoria tritici, and Blumeria hordei. These challenges are illustrated by a case study. To conclude, the chapter discusses ways to improve communication to prevent and cope with fungicide resistance.
- 1 Introduction
- 2 Overview of Australia and New Zealand cropproduction and fungicide use
- 3 Incidence of known resistance
- 4 Fungicide resistance in Botrytis cinerea
- 5 Fungicide resistance in Venturia inaequalis
- 6 Fungicide resistance in Pyrenophora teres spp.
- 7 Fungicide resistance in Zymoseptoria tritici
- 8 Fungicide resistance in Blumeria hordei
- 9 Likely trends in resistance
- 10 Case study: Fungicide resistance in Blumeriagraminis in Australia
- 11 Fungicide resistance management needs:improving communication
- 12 Conclusion
- 13 Acknowledgements
- 14 Where to look for further information
- 15 References