Biogenic silicon dioxide nanoparticles (SiO-NPs_bio) synthesized using were combined with in a Pickering emulsion to enhance fungal bioavailability and insecticidal efficacy. The biogenic nanoparticles exhibited larger diameters (324 ± 3 nm) and lower ζ-potential (-23 ± 0.2 mV) than commercial SiO-NPs, while showing no significant cytotoxicity in HaCat and 3T3 cell lines. Encapsulation markedly improved fungal performance, resulting in 100% mortality of , , and , and 86% mortality of , significantly higher than isolated nanoparticles or fungus. The nanoformulation also protected against UV radiation and showed no phytotoxic effects. This study demonstrates, for the first time, a sustainable biogenic SiO-based Pickering emulsion as an effective carrier for entomopathogenic fungi in pest control.