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The bacterial wilt is a global destructive plant disease that initiated by the phytopathogenic  Ralstonia solanacearum . This study display a novel biofabrication of silica/silver nanocomposite using  Fusarium oxysporum -fermented rice husk (RH) under solid state fermentation (SSF). The biofabricated nanocomposite was characterized by XRD, UV–Vis. spectroscopy, DLS, SEM, EDX elemental mapping, and TEM analyses as well as investigated for anti- R. solanacearum  activity. Response surface methodology was also processed for optimizing the biofabrication process and improving the anti-bacterial activity of the fabricated nanocomposite. Maximum suppression zone of 29.5 mm against  R. solanacearum  was reached at optimum RH content of 6.0 g, AgNO 3  concentration of 2.50 mM, reaction pH of 6.3, and reaction time of 2 days. The anti- R. solanacearum  activity of the fabricated nanocomposite was further improved by exposing the  F. oxysporum  strain to a gamma irradiation dose of 200 Gy. In conclusion, RH recycling under SSF by  F. oxysporum  could provide an innovative, facile, non-expensive, and green approach for fabricating SiO 2 /Ag nanocomposite that could be applied efficiently as an eco-friendly antibacterial agent to combat  R. solanacearum  in agricultural applications. Moreover, the developed method could serve as a significant platform for the designing of new nanostructures for broad applications.

Novel fabrication of SiO2/Ag nanocomposite by gamma irradiated Fusarium oxysporum to combat Ralstonia solanacearum