Lack of Antagonism between the Biocontrol Agent 'Gliocladium virens' andVesicular Arbuscular Mycorrhizal Fungi

摘要

The effect of the fungal biocontrol agent Gliocladium virens Miller, Giddens andFoster on the colonization of cucumber by the VA mycorrhizal fungi Glomus etunicatum Becker and Gerdemann and Glomus mosseae (Nicol. and Gerd.) Gerdemann and Trappe was investigated. Inoculum of G. virens grown on wheat bran or peatmoss-Czapek substrate, was added to soil artificially infested with Pythium ultimum Trow. Damping-off of cucumber and pathogen population density were reduced in treatments with G. Virens. Inoculum of G. virens was also added to soils containing increasing propagule densities of Glomus etunicatum or Glomus mosseae. When grown on wheat bran, G. virens was phytotoxic and increased mycorrhizal colonization by Glomus etunicatum. However, G. virens had no effect on Glomus etunicatum when added as peatmoss-Czapek inoculum.