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In the present study, capped and uncapped silver, iron oxide and titanium dioxide nanoparticles were synthesized from the filtrate of <jats:italic>Beauveria bassiana<\/jats:italic> and evaluated in regard to physico\u2010chemical characteristics, capping composition, cytotoxicity, genotoxicity and biological activity on <jats:italic>Helicoverpa armigera<\/jats:italic> and <jats:italic>Spodoptera frugiperda<\/jats:italic> caterpillars.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>A difference in the physico\u2010chemical parameters of the capped and uncapped nanoparticles was observed, with larger aggregation and lower stability of the uncapped. In regard to the study of the capping, the presence of functional groups of biomolecules as well as the activity of <jats:italic>B. bassiana<\/jats:italic> hydrolytic enzymes were observed. Cytotoxic effects on the tested cell lines were not observed and DNA damage levels increased with more intense effects of the uncapped nanoparticles. In regard to the biological activity against Noctuidae pests, the uncapped and capped iron oxide, and uncapped titanium dioxide nanoparticles occasioned higher mortality (76%, 60% and 51%, respectively) but no differences in LC<jats:sub>50<\/jats:sub> were recorded. Moreover, sublethal effects were reported on <jats:italic>Helicoverpa armigera<\/jats:italic> whereas <jats:italic>Spodoptera frugiperda<\/jats:italic> showed low susceptibility to the nanoparticles.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSION<\/jats:title><jats:p>The results demonstrate that biogenic metallic and oxide metal nanoparticles might show promising effects for the control of caterpillars which cause damage on important agricultural crops. Further investigations are necessary to understand the mechanisms of action and optimize the biological activity of these new nanomaterials. \u00a9 2023 Society of Chemical Industry.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ps.7863","type":"journal-article","created":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T00:03:59Z","timestamp":1698710639000},"page":"1325-1337","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["<i>Beauveria bassiana<\/i> biogenic nanoparticles for the control of Noctuidae pests"],"prefix":"10.1002","volume":"80","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2206-9899","authenticated-orcid":false,"given":"Mariana","family":"Guilger\u2010Casagrande","sequence":"first","affiliation":[{"name":"Laboratory of Environmental Nanotechnology S\u00e3o Paulo State University  S\u00e3o Paulo Brazil"},{"name":"Laboratory for Evaluation of the Bioactivity and Toxicology of Nanomaterials University 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