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RESEARCH ARTICLE
Contents Vol 45(9)

Variation in colonisation of Lolium rigidum by isolates of Dilophospora alopecuri, an antagonist of the causal organisms of annual ryegrass toxicity

G. Yan A B C and I. T. Riley D E
+ Author Affiliations
- Author Affiliations

A WA Department of Agriculture, Baron-Hay Court, South Perth, WA 6151, Australia.

B Kunming Division, Xishuangbanna Tropical Botanical Garden, The Chinese Academy of Sciences, 88 Xuefu Road, Kunming 650223, Yunnan, China.

C Current address: Department of Environmental Biology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.

D Plant and Pest Science, School of Agriculture and Wine, University of Adelaide, Glen Osmond, SA 5064, Australia.

E Corresponding author. Email: ian.riley@adelaide.edu.au

Australian Journal of Experimental Agriculture 45(9) 1157-1162 https://doi.org/10.1071/EA04012
Submitted: 3 February 2004  Accepted: 13 December 2004   Published: 10 October 2005

Abstract

The ability of 31 isolates of Dilophospora alopecuri to colonise Lolium rigidum co-inoculated with Anguina funesta and grown in pots outdoors was tested over 2 years. The isolates were collected from 3 grass hosts from sites across the southern mainland states of Australia. Marked variation among isolates of different host and regional origins was found. Isolates from L. rigidum showed the greatest colonisation with a mean of 16 infected inflorescences per 240 mm pot containing 32 plants. Isolates from the other hosts, Avena sativa, Holcus lanatus and Polypogon monspeliensis, only resulted in means of 1.9, 7.7 and 1.3 infected inflorescences per pot, respectively. The data allow selection of an aggressive isolate for dissemination for antagonism of A. funesta, one of the causal agents for annual ryegrass toxicity.

Additional keywords: Rathayibacter toxicus, biocontrol.


Acknowledgments

This study is supported by the grain and wool growers of Australia and the Australian Government through the Grains Research and Development Corporation and the Woolmark Co.. P. Murphy, H. Hunter, C. Tonkin and M. Eyres are thanked for technical support.


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