| Summary: | <i>Hermetia illucens</i> is an important species for waste management and the circular economy. The aim of this study was to analyze the effects of <i>Trichoderma reesei</i> C2A and <i>Pleurotus</i> sp. as pretreatments of brewer spent grain (BSG). BSG was inoculated with fungal solution or distilled water (control). After seven days, this was used for <i>H. illucens</i> larvae cultivation. At the end of bioconversion process, parameters of substrate reduction and <i>H. illucens</i> larval development were evaluated. Chemical properties of BSG, frass and larvae were also analyzed. With <i>T. reesei</i> C2A pretreatment, highest substrate reduction (46.3 ± 0.9%) was achieved, but larval growth rate was lower (1.0 ± 0.1 mg/d) than that of control (2.8 ± 0.2 mg/d). Larvae of <i>Pleurotus</i> sp. pretreatment had limited development, reflected in their negative growth rate (−0.6 ± 0.2 mg/d). In conclusion, cultivation of <i>H. illucens</i> larvae (six day old) on BSG pretreated with <i>Pleurotus</i> sp. is not recommended. On the other hand, <i>T. reesei</i> C2A pretreatment enhance BSG reduction, and its potential use for lignocellulosic waste management should be more explored.
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