IN VITRO ANTAGONISTIC EFFECTS OF TRICHODERMA SPP. ON SEVERAL SOIL- BORNE PLANT PATHOGENIC FUNGI

摘要

In vitro studies with Trichoderma spp., soil-borne fungal antagonists, dem- onstrated that a number of isolates produced volatile and non-volatile metabo- lites capable of inhibiting the growth and sporulation of several soil-borne plant pathogenic fungi. Microscopic observations showed that T. harzianum and T. viride, isolated from soil samples from Ahwaz and Karaj, adversely affected the mycelial growth of Rhizoctonia solani, the causal agent of seed, root rot and damping-off of bean, by hyphal contact, coiling, penetration, necrosis, lysis and in some cases fragmentation of the pathogen hyphae.