Indigenous fungi as pathogens of crops: some examples from Australia

Ryley, Malcolm and Shivas, Roger (2013) Indigenous fungi as pathogens of crops: some examples from Australia. In: Asian Mycological Congress 2013 and 13th International Marine and Freshwater Mycology Symposium (AMC 2013), 19-23 Aug 2103, Beijing, China.

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Abstract

Several species of Peronosclerospora (Peronosporaceae, Oomycetes) which cause downy mildew on grasses (Poaceae) have been recorded in Australia, with two, Peronosclerospora noblei and P. sargae, being found only on wild grasses indigenous to Australia. The only downy mildew species which has caused significant damage on a cultivated grass crop in Australia was P. sacchari on sugarcane (Saccharum officinarum), but that pathogen is now considered to be eradicated. Separate outbreaks of downy mildew on maize (Zea mays) have been recorded in northern Australia and in southern Queensland over the past 3 decades, both being attributed to Peronosclerospora maydis, a serious pathogen of maize overseas. At that time, the identification of Peronosclerospora species was based on the morphology of the anamorph and/or of the teleomorph but the published descriptions of the asexual spore dimensions of different Peronosclerospora species often overlapped. Recent molecular studies have demonstrated that the downy mildew outbreaks on maize in northern Australia are most likely due to the newly described P. australiensis which is a pathogen of two indigenous, endemic Sorghum species. Similarly, the outbreak of maize downy mildew in southern Queensland was actually caused by P. eriochloae which up until that time had been found only on indigenous Eriochloa species. These recent findings of pathogens on indigenous, endemic hosts causing disease outbreaks on cultivated crops reinforce the need for ongoing taxonomic studies of such pathogens.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 04 Jun 2014 23:19
Last Modified: 19 Jun 2017 02:18
Uncontrolled Keywords: downy mildew; grasses; Queensland; spores; maize
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: D Environment > 96 Environment > 9604 Control of Pests, Diseases and Exotic Species > 960405 Control of Pests, Diseases and Exotic Species at Regional or Larger Scales
URI: http://eprints.usq.edu.au/id/eprint/25154

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