Several species of nematode-trapping fungi, including A. oligospora, can attack other fungi, e.g., Rhizoctonia solani (Persson et al. 1985). This mycoparasitic behavior takes place by coiling of the hyphae of the nematode-trapping fungi around the host hyphae, which results in disintegration of the host cell cytoplasm without penetration of the host. Although this phenomenon has never been observed in soil it may increase the fitness of the nematode-trapping fungi in soil by reducing competition and providing nutrients. Moreover it may extend the biocontrol capability of nematophagous fungi as biocontrol agents (BCAs) to fungal parasites as well as nematodes. Furthermore, P. chlamydosporia has been described infecting propagules of important plant pathogens, such as uredospores of rust fungi (Leinhos and Buchenauer 1992), and oospores of Phytophthora and other oomycetes (Sneh et al. 1977).

4.4 Roots

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