For hydrogen peroxide exposure, dark inactivation of fungal suspensions increased with increasing peroxide concentration and experimental time. At initial hydrogen peroxide concentrations of 5 mg/L and 50 mg/L, the F. solani spore concentration was still unaffected after 3 h. After 5 h, H2O2 concentrations of 5 mg/L were able to reduce fungal CFUs slightly (0.2 log). The 50 mg/L H2O2 concentration produced a 0.4 log reduction after 5 h. Exposure to 100 mg/L H2O2 already showed a slight effect on spore concentration, with a 0.5 log reduction after 3 h and 0.6 log reduction by the end of the experiment. F. solani suspensions were reduced 1.3 logs by 500 mg/L H2O2 after 3 h and 1.5 logs by the end of the experiment. In no experiment was the detection limit of 2 CFU, corresponding to a 2.7 log reduction in fungal CFUs, reached.