Colony morphology, growth rate, conidia production, and trap formation ability of wild-type (WT) strain and UV-induced mutants (DW06 and DW07). (A) Top and bottom views of colonies of WT, DW06, and DW07 on the PDA medium. (B) Colony diameter of WT and mutants on the PDA medium. Data represent mean ± standard deviation (SD) (n = 4). (C) Spore production per square centimeter of colonies of WT and mutants after 10 days on CMA medium. Data represent mean ± standard deviation (SD) (n = 3). (D) Traps formed by WT, DW06, and DW07 strains after co-cultivation with nematodes for 24 h. The red arrow points to the normal constricting ring trap, and the black arrow points to the abnormal constricting ring trap. (E) Number of normal constricting rings induced by nematodes. Data represent mean ± standard deviation (SD) (n = 3). In (B), two-way ANOVA analysis was conducted. In (C,E), t-test analysis was performed. *, p ≤ 0.05; **, p ≤ 0.01; ***, p ≤ 0.001; ****, p ≤ 0.0001; ns, p > 0.05.