Bean yellow mosaic virus (BYMV) which belongs to Potyvirus genus, is able to infect wide range of plants because of its wide host range. This virus is transmitted by mechanical inoculation and aphid vectors in non-persistent manner. In this research the effects of six treatments including: synthesized silver nano particles of P. fluorescens CHA0, preparations of T. harizianum and P. fluorescens CHA0, olive (Olea europaea) and yarrow (Achillea millefolium) extracts and potassium phosphite on damage reduction in three common bean genotypes against a BYMV isolate was investigated. This experiment was carried out in a completely randomized factorial design. For this purpose, treatments were applied on plants immediately afterward first symptoms in mechanically inoculated plants were appeared. Virus concentration in treated plants was evaluated by DAS-ELISA test using BYMV polycolonal antibody. Evaluation of vegetative and reproductive parameters, measurement of peroxidase and polyphenol oxidase enzymes activity and virus accumulation indicated that potassium phosphite, silver nano particles of P. fluorescens CHA0 and yarrow extracts had highest influence on virus accumulation
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