doi:10.1071/EA04012

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, I. T. Riley ^D ^E

^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





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Australian Journal of Experimental Agriculture 45(9) 1157–1162 http://dx.doi.org/10.1071/EA04012
Submitted: 3 February 2004 Accepted: 13 December 2004 Published online: 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.

Keywords: Rathayibacter toxicus, biocontrol.

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