Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Anguina australis, a vector for Rathayibacter toxicus in Ehrharta longiflora.

Abstract

A. australis, a leaf gall nematode of E. longiflora (annual veldtgrass) common in Western Australia (WA), was examined for its ability to act as a vector for R. toxicus, the bacterium responsible for various grass toxicities, including annual ryegrass toxicity in WA. The receptiveness of juveniles of A. australis, A. microlaenae and A. tritici to adhesion by a range of strains of R. toxicus and related species was tested in vitro. R. toxicus was the only species to adhere to A. australis juveniles. Inoculation of E. longiflora plants with A. australis and R. toxicus-infected galls from Lolium rigidum resulted in bacterial colonization of a proportion of galls formed. R. toxicus was isolated from these galls and bacterial inhibition assays indicated that toxins had been produced. It is concluded that A. australis is a vector for R. toxicus and that infested E. longiflora in WA may pose a risk to livestock.