A New Approach To Managing Loose Smut On Barley

GRDC - Kithsiri Jayasena, Geoff Thomas, Andrea Hills, Laurie Wahlsten & Mirjana Banovic

Type: Research Paper
Knowledge level: Advanced

Farm Table says:

The authors of this paper note in the conclusion: "Applications of systemic foliar fungicide containing the active ingredient tebuconazole at ear emergence to late flowering can reduce loose smut infection in subsequent forming seed. While spore trapping in the region can provide information on when the loose smut spores are in the air, foliar fungicide spraying should be based on when the crop is most vulnerable (ear emergence). Since foliar fungicide can reduce loose smut levels in the following barley crop this application method could be integrated into the loose smut management plans for barley. When using fungicide at late foliar stages, the minimum withholding period of the product should be considered to avoid residue violations in delivered grain." Please access the full paper via the link below if this research interests you.

The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.

Take key messages from the paper include:

  • Loose smut is a seed-borne disease in barley, generally controlled using seed dressings that prevent infected seed from expressing the disease in-crop.
  • This study demonstrates that another effective way to reduce loose smut in subsequent seasons is to apply foliar fungicides from ear emergence to anthesis to prevent seed infection occurring. This approach can significantly reduce seed infection rates compared to unprotected crops.
  • An added advantage is that these fungicides are registered in barley and used for management of other fungal diseases. Therefore, this approach can be integrated into current disease management practices or used specifically in seed production crops to maintain seed of the highest quality.

2020 - Australia - GRDC - Kithsiri Jayasena, Geoff Thomas, Andrea Hills, Laurie Wahlsten & Mirjana Banovic
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