Plutella xylostella (Lepidoptera: Yponomeutidae) is an oligophagous pest that causes significant production losses in Brassicaceae crops, resulting in economic losses of around 4-5 billion USD per year worldwide. This study used a Randomized Block Design (RBD) to test the pathogenicity of 20 endophytic fungal isolates against P. xylostella larvae through seed treatment on pak choi (Brassica rap…