Abstract
A study was undertaken to investigate the host specificity of the infective stage of the seed-gall forming nematode, Anguina funesta, the vector of a toxigenic bacterium, Clavibacter sp., associated with annual ryegrass toxicity. The numbers of second stage juveniles (J2s) invading Avenafatua, Hordeum leporinum, Lolium rigidum and Vulpia myuros grown in pots in the presence or absence of L. rigidum, the common host in southern Australia, were determined. Differential invasion of the grasses occurred, with L. rigidum and V. myuros being invaded by 10 to 100 times the number of J2s invading A. fatua and H. leporinum. Examination for galls at flowering and maturity revealed that V. myuros was a poor host of A. funesta. The invasion of non-host grasses by A. funesta provides the mechanism for these grasses to be infected by the plant pathogens, Clavibacter sp. and Dilophospora alopecuri.
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