SOD1 and infection: At 24 h post-infection (Figure 5), significant differences in the SOD and CAT activities of larvae were observed among each strain treatment group and the CK group (p < 0.05), with SOD activities decreasing in the order of CGMCC3.2055, Bb01, BbZ1, bio-21738, CK, and CFCC81428, and CAT activities in the order of BbZ1, Bb01, CGMCC3.2055, CFCC81428, CK, and bio-21738.