Antagonistic properties of species-groups of Trichoderma: II. Production of volatile antibiotics

TLDR: Isolates from different species-groups of Trichoderma were tested for production of non-volatile antibiotics, by an agar layer technique; the susceptibility of fungi to these antibiotics varied widely; Fomes annosus (Fr.) Cooke was the most susceptible and Fusarium oxysporum Schlecht, ex Fr.

Abstract: Isolates from different species-groups of Trichoderma were tested for production of non-volatile antibiotics, by an agar layer technique. Preliminary studies on the chemical nature of these antibiotics were made. Many isolates produced non-volatile antibiotics active against a range of fungi. The ability to produce such antibiotics varied between isolates of the same species-group as well as between isolates of different species groups. The susceptibility of fungi to these antibiotics varied widely; Fomes annosus (Fr.) Cooke was the most susceptible and Fusarium oxysporum Schlecht, ex Fr. the most resistant of the test fungi used. Gliotoxin and viridin were not produced, but other chloroform-soluble antibiotics, including trichodermin and peptide antibiotics were detected.