The soybean mosaic virus (SMV) was readily sap transmissible to test plants when the inoculum was prepared in 0.1M Phosphate buffer (pH 7.0) and produced systematic symptoms like light and dark green patches on upper leaves of soybean. Among the insects viz., aphids and whiteflies, only aphids (Myzus persicae Sultz) transmitted the SMV from soybean to soybean (20-40%). The SMV under study was seed borne in nature and accounted for 32.94 per cent seed transmission.