Özet:

In this research on the biological control of tomato wilt disease caused by Fusarium oxysporum f.sp. lycopersici (FOL), a total of 29 candidate fungal antagonists were isolated from tomato rhizospheres. All of the tested Aspergillus and Penicillum species inhibited the in vitro mycelial growth of FOL but at different levels. While all these fungi produced inhibition zones on PDA medium, some of them preceded with their volatile and non-volatile antibiotics or mycelial competition. Trichoderma species, which were isolated at low frequency, exhibited a suppressive effect on the mycelial growth rate of FOL via volatile and non-volatile antibiotic production in vitro. In addition, Aspergillus flavus, Penicillium griseofulvum and Trichoderma aggressivum inoculation inhibited disease incidence in plants by 26.3%, 31.6% and 21.1%, respectively. However, T. brevicompactum was the most effective fungus; it reduced the incidence of disease by 78.9%.