Biocontrol of Some Fungal Pathogen that Cause Plant Diseases by Some Bio Agents

Fungal plant pathogens are among the most important factors that cause serious losses to agricultural products every year. Biological control of plant diseases including fungal pathogens has been considered a viable alternative method to chemical control. In plant pathology, biocontrol applied some microbes to suppress soil borne and airborne pathogens in an attempt to replace existing methods of chemical control by fungicides, which often lead to resistance in plant pathogens. In this review, we present the effect of mycorrhizae, actinomycetes and Trichoderma on plant growth and biocontrol of some fungal pathogens under stress conditions. The biological performance of mycorrhizae and Actinomycetes in soil is important for plant growth and development in stressed environments. In agriculture, plant growth promoting Actinomycetes can be used as biocontrol microorganisms and they had a big role in antibiotic production. They are well- known as active producers of a wide range of secondary metabolites, antibiotics and volatile organic compounds that can inhibit the growth of phytopathogenic fungi and bacteria. In particular, mycorrhizae and Trichoderma spores are found in soil and enhance both plant growth and decrease fungal infections. These antagonistic microorganisms are abundant in soils around the roots of economically and nutritionally valuable crops. Their interactions with plant pathogens can significantly affect plant health in various ways. Different mode of actions of biocontrol-active microorganisms in controlling fungal plant diseases include hyper parasitism, predation, antibiosis, cross protection, competition for site and nutrient and induced resistance. In conclusion, some microorganisms can used to suppress some phytopathogens and improve plant growth