Öz
Fungi used as one of the biological factors constitute an important group in biological control studies. In this review, the role of entomopathogenic fungi used in biological control in ensuring the natural balance of pest populations and the interactions of mycorrhizal fungi with plant, soil and plant pathogens in biological control are mentioned. In addition, information was given about the action mechanisms of entomopathogenic fungi and mycorrhizal fungi in biological control and their contribution to plant growth. It is aimed to emphasize that entomopathogenic fungi and mycorrhizaes can be used successfully both in plant protection and in plant nutrition against chemicals in agriculture. In this regard, the work done in Turkey to be taken a little further point in giving weight to the carrier formulation and updating of the regulations on licensing according to scientific studies will be very useful.