Fig. 5. Scanning electron micrographs of the bacteriostatic treatment of R. solanacearum. (A) The strains incubated at 30 °C for 24 h were designated as the blank control group with 2500k× magnification; (B) the strains treated with 4 mg mL⁻¹ API were designated as the treatment group with 2500k× magnification; (C) the strains treated with 4 mg mL⁻¹ nanoparticles loaded with MC and CAPE were designated as the treatment group with 2500k× magnification; (D) the strains treated with 4 mg mL⁻¹ nanoparticles loaded with MC and CAPE were designated as the treatment group with 4500k× magnification.