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Spot form of net blotch suppression and yield of barley in response to fungicide application in the Wimmera region of Victoria, Australia

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Abstract

Spot form of net blotch (SFNB), caused by Pyrenophora teres f. maculata caused up to 25 % (0.9 t/ha) grain yield loss to barley and significant reductions in grain quality parameters such as retention (13 %), screenings (5 %) and grain weight (6 %) in the Wimmera region of Victoria during 2005–11. Spot form of net blotch was suppressed by varying degrees between experiments, seasons, and crop growth stages when foliar fungicide (propiconazole) was applied. Of single applications, treatment at the stem elongation (Z31) or flag leaf (Z39) growth stages generally provided the greatest disease suppression. Single application at tillering (Z25) or ear emergence (Z55) were generally ineffective. Eight chemical seed treatments registered for use in barley were tested as potential low cost management options for SFNB. Four seed treatments reduced SFNB severity in the glasshouse, but none were effective in the field.

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Acknowledgments

The authors thank the Grains Research and Development Corporation and the Victorian Department of Economic Development, Jobs, Transport and Resources for support and funding. We thank Kevin Pymer at Wonwondah for providing field sites. Graham Exell, Jonathan Bretag, Peter Donaldson, Sharyn Andrews, Dennis Ward and David Hoffmann for technical assistance. We also thank Geoff Robertson (Bayer), Chemtura, Hamish Mines (Cropcare) and Neville Marra (Syngenta) for providing seed treatments. Lastly we thank Jenny Smith for assistance with data collation and statistical analyses.

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Authors and Affiliations

  1. Department of Economic Development, Jobs, Transport and Resources, Biosciences Research Division, Horsham, Victoria, 3401, Australia

    Mark S. McLean, Rob Weppler & Grant J. Hollaway

  2. School of BioSciences, The University of Melbourne, Parkville, Victoria, 3010, Australia

    Barbara J. Howlett

  3. Riverina IPM Pty Ltd, Griffith, NSW, 2680, Australia

    Rob Weppler

Authors
  1. Mark S. McLean
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  2. Rob Weppler
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  3. Barbara J. Howlett
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  4. Grant J. Hollaway
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Correspondence to Mark S. McLean.

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McLean, M.S., Weppler, R., Howlett, B.J. et al. Spot form of net blotch suppression and yield of barley in response to fungicide application in the Wimmera region of Victoria, Australia. Australasian Plant Pathol. 45, 37–43 (2016). https://doi.org/10.1007/s13313-015-0387-y

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  • DOI: https://doi.org/10.1007/s13313-015-0387-y

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