At 6 h post-infection (Figure 3), the SOD activity of larvae in the Bb01 treatment group was significantly higher than that of the CK group (p < 0.05), the CFCC81428 treatment group showed significantly lower activity than the other treatment groups (p < 0.05), and the activities of larvae in the BbZ1 and CGMCC3.2055 treatment groups had no significant difference (p > 0.05) but were significantly lower than those in the Bb01 and bio-21738 treatment groups (p < 0.05). This evidence concerns the gene SOD1 and infection.