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New mechanism of fungicide resistance in spot type of net blotch discovered

Fran Lopez-Ruiz from the Centre for Crop and Disease Management (CCDM) explains the recent detections of fungicide resistance to spot form of net blotch in barley and the importance of its management, especially in southern Western Australia.

The CCDM has received and analysed multiple samples from barley paddocks which have been found to have a new mechanism of resistance.

Management strategies are important to reduce the impact of this new resistance.  

It is important to manage:

  • Crop rotations;
  • Chemistry rotations of fungicides;
  • The green bridge; and
  • Stubble.

With many crops in 2018 having been cut for hay, it is important to be mindful that resistance can spread when hay is moved across these sometimes very large geographical areas. It is a good idea to get samples tested to know if there is fungicide resistance, if spot type of net blotch has been prevalent in the crop.

Using a variety of tools is the best approach to effectively manage disease and fungicide resistance. The CCDM and GRDC are seeking input from industry and growers to help identify and understand resistance and how best the industry can move forward and tackle problems like this more efficiently. CCDM researchers use samples to assist with a range of crop disease research.

If you suspect you have fungicide resistance in your paddock, please email the Centre for Crop and Disease Management’s fungicide resistance team at

Further Information

Fungicide resistant diseases in Australian grains

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